Avoid re-starting a ExternalCCResultFetcher if a previous has finished or timed out.

ios/chrome/browser/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ios/rules.gni")
 import("//rlz/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
   google_test_gaia_client_secret = ""
+  google_staging_oauth_url = ""
   google_staging_api_url = ""
   google_staging_lso_url = ""
   google_test_api_url = ""
   google_test_lso_url = ""
   google_test_oauth_client_id = ""
   google_test_oauth_client_secret = ""
   google_test_oauth_url = ""
   google_test_sync_url = ""
 }
 
@@ skipping 168 matching lines @@
   if (enable_rlz) {
     deps += [ "//ios/chrome/browser/rlz" ]
   }
 }
 
 buildflag_header("google_api_keys_header") {
   header = "google_api_keys.h"
   flags = [
     "GOOGLE_STAGING_API_URL=\"$google_staging_api_url\"",
     "GOOGLE_STAGING_LSO_URL=\"$google_staging_lso_url\"",
+    "GOOGLE_STAGING_OAUTH_URL=\"$google_staging_oauth_url\"",
     "GOOGLE_TEST_API_URL=\"$google_test_api_url\"",
     "GOOGLE_TEST_LSO_URL=\"$google_test_lso_url\"",
     "GOOGLE_TEST_OAUTH_CLIENT_ID=\"$google_test_oauth_client_id\"",
     "GOOGLE_TEST_OAUTH_CLIENT_SECRET=\"$google_test_oauth_client_secret\"",
     "GOOGLE_TEST_OAUTH_URL=\"$google_test_oauth_url\"",
     "GOOGLE_TEST_SYNC_URL=\"$google_test_sync_url\"",
   ]
 }
 
 bundle_data("settings_resources") {
@@ skipping 38 matching lines @@
 
 source_set("browser_internal") {
   sources = [
     "callback_counter.h",
     "callback_counter.mm",
   ]
   deps = [
     "//base",
   ]
 }