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diff --git a/third_party/git/credential.h b/third_party/git/credential.h
deleted file mode 100644
index c0e17e3554..0000000000
--- a/third_party/git/credential.h
+++ /dev/null
@@ -1,195 +0,0 @@
-#ifndef CREDENTIAL_H
-#define CREDENTIAL_H
-
-#include "string-list.h"
-
-/**
- * The credentials API provides an abstracted way of gathering username and
- * password credentials from the user.
- *
- * Typical setup
- * -------------
- *
- * ------------
- * +-----------------------+
- * | Git code (C)          |--- to server requiring --->
- * |                       |        authentication
- * |.......................|
- * | C credential API      |--- prompt ---> User
- * +-----------------------+
- * 	^      |
- * 	| pipe |
- * 	|      v
- * +-----------------------+
- * | Git credential helper |
- * +-----------------------+
- * ------------
- *
- * The Git code (typically a remote-helper) will call the C API to obtain
- * credential data like a login/password pair (credential_fill). The
- * API will itself call a remote helper (e.g. "git credential-cache" or
- * "git credential-store") that may retrieve credential data from a
- * store. If the credential helper cannot find the information, the C API
- * will prompt the user. Then, the caller of the API takes care of
- * contacting the server, and does the actual authentication.
- *
- * C API
- * -----
- *
- * The credential C API is meant to be called by Git code which needs to
- * acquire or store a credential. It is centered around an object
- * representing a single credential and provides three basic operations:
- * fill (acquire credentials by calling helpers and/or prompting the user),
- * approve (mark a credential as successfully used so that it can be stored
- * for later use), and reject (mark a credential as unsuccessful so that it
- * can be erased from any persistent storage).
- *
- * Example
- * ~~~~~~~
- *
- * The example below shows how the functions of the credential API could be
- * used to login to a fictitious "foo" service on a remote host:
- *
- * -----------------------------------------------------------------------
- * int foo_login(struct foo_connection *f)
- * {
- * 	int status;
- * 	// Create a credential with some context; we don't yet know the
- * 	// username or password.
- *
- * struct credential c = CREDENTIAL_INIT;
- * c.protocol = xstrdup("foo");
- * c.host = xstrdup(f->hostname);
- *
- * // Fill in the username and password fields by contacting
- * // helpers and/or asking the user. The function will die if it
- * // fails.
- * credential_fill(&c);
- *
- * // Otherwise, we have a username and password. Try to use it.
- *
- * status = send_foo_login(f, c.username, c.password);
- * switch (status) {
- * case FOO_OK:
- * // It worked. Store the credential for later use.
- * credential_accept(&c);
- * break;
- * case FOO_BAD_LOGIN:
- * // Erase the credential from storage so we don't try it again.
- * credential_reject(&c);
- * break;
- * default:
- * // Some other error occurred. We don't know if the
- * // credential is good or bad, so report nothing to the
- * // credential subsystem.
- * }
- *
- * // Free any associated resources.
- * credential_clear(&c);
- *
- * return status;
- * }
- * -----------------------------------------------------------------------
- */
-
-
-/**
- * This struct represents a single username/password combination
- * along with any associated context. All string fields should be
- * heap-allocated (or NULL if they are not known or not applicable).
- * The meaning of the individual context fields is the same as
- * their counterparts in the helper protocol.
- *
- * This struct should always be initialized with `CREDENTIAL_INIT` or
- * `credential_init`.
- */
-struct credential {
-
-	/**
-	 * A `string_list` of helpers. Each string specifies an external
-	 * helper which will be run, in order, to either acquire or store
-	 * credentials. This list is filled-in by the API functions
-	 * according to the corresponding configuration variables before
-	 * consulting helpers, so there usually is no need for a caller to
-	 * modify the helpers field at all.
-	 */
-	struct string_list helpers;
-
-	unsigned approved:1,
-		 configured:1,
-		 quit:1,
-		 use_http_path:1,
-		 username_from_proto:1;
-
-	char *username;
-	char *password;
-	char *protocol;
-	char *host;
-	char *path;
-};
-
-#define CREDENTIAL_INIT { STRING_LIST_INIT_DUP }
-
-/* Initialize a credential structure, setting all fields to empty. */
-void credential_init(struct credential *);
-
-/**
- * Free any resources associated with the credential structure, returning
- * it to a pristine initialized state.
- */
-void credential_clear(struct credential *);
-
-/**
- * Instruct the credential subsystem to fill the username and
- * password fields of the passed credential struct by first
- * consulting helpers, then asking the user. After this function
- * returns, the username and password fields of the credential are
- * guaranteed to be non-NULL. If an error occurs, the function will
- * die().
- */
-void credential_fill(struct credential *);
-
-/**
- * Inform the credential subsystem that the provided credentials
- * were successfully used for authentication.  This will cause the
- * credential subsystem to notify any helpers of the approval, so
- * that they may store the result to be used again.  Any errors
- * from helpers are ignored.
- */
-void credential_approve(struct credential *);
-
-/**
- * Inform the credential subsystem that the provided credentials
- * have been rejected. This will cause the credential subsystem to
- * notify any helpers of the rejection (which allows them, for
- * example, to purge the invalid credentials from storage). It
- * will also free() the username and password fields of the
- * credential and set them to NULL (readying the credential for
- * another call to `credential_fill`). Any errors from helpers are
- * ignored.
- */
-void credential_reject(struct credential *);
-
-int credential_read(struct credential *, FILE *);
-void credential_write(const struct credential *, FILE *);
-
-/*
- * Parse a url into a credential struct, replacing any existing contents.
- *
- * If the url can't be parsed (e.g., a missing "proto://" component), the
- * resulting credential will be empty and the function will return an
- * error (even in the "gently" form).
- *
- * If we encounter a component which cannot be represented as a credential
- * value (e.g., because it contains a newline), the "gently" form will return
- * an error but leave the broken state in the credential object for further
- * examination.  The non-gentle form will issue a warning to stderr and return
- * an empty credential.
- */
-void credential_from_url(struct credential *, const char *url);
-int credential_from_url_gently(struct credential *, const char *url, int quiet);
-
-int credential_match(const struct credential *want,
-		     const struct credential *have);
-
-#endif /* CREDENTIAL_H */