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

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

+// Copyright 2017 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_remove_cached_auth_token_function.h"
+
+#include "chrome/browser/extensions/api/identity/identity_api.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/extensions/api/identity.h"
+
+namespace extensions {
+
+namespace identity = api::identity;
+
+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