Move impl of identity.RemoveCachedAuthToken() extension API to its own file

chrome/browser/extensions/api/identity/identity_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/identity/identity_api.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
@@ skipping 901 matching lines @@
   api::identity::ProfileUserInfo profile_user_info;
   if (extension()->permissions_data()->HasAPIPermission(
           APIPermission::kIdentityEmail)) {
     profile_user_info.email = account.email;
     profile_user_info.id = account.gaia;
   }
 
   return RespondNow(OneArgument(profile_user_info.ToValue()));
 }
 
-IdentityRemoveCachedAuthTokenFunction::IdentityRemoveCachedAuthTokenFunction() {
-}
-
-IdentityRemoveCachedAuthTokenFunction::
-    ~IdentityRemoveCachedAuthTokenFunction() {
-}
-
-ExtensionFunction::ResponseAction IdentityRemoveCachedAuthTokenFunction::Run() {
-  if (Profile::FromBrowserContext(browser_context())->IsOffTheRecord())
-    return RespondNow(Error(identity_constants::kOffTheRecord));
-
-  std::unique_ptr<identity::RemoveCachedAuthToken::Params> params(
-      identity::RemoveCachedAuthToken::Params::Create(*args_));
-  EXTENSION_FUNCTION_VALIDATE(params.get());
-  IdentityAPI::GetFactoryInstance()
-      ->Get(browser_context())
-      ->EraseCachedToken(extension()->id(), params->details.token);
-  return RespondNow(NoArguments());
-}
-
 }  // namespace extensions