[Extensions] Begin making Extension port initialization asynchronous

chrome/renderer/BUILD.gn

 # Copyright 2014 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/config/features.gni")
 import("//tools/grit/grit_rule.gni")
 
 # GYP version: chrome/chrome_resources.gyp:chrome_resources
 # (generate_renderer_resources action)
 grit("resources") {
@@ skipping 224 matching lines @@
       "extensions/page_capture_custom_bindings.cc",
       "extensions/page_capture_custom_bindings.h",
       "extensions/platform_keys_natives.cc",
       "extensions/platform_keys_natives.h",
       "extensions/renderer_permissions_policy_delegate.cc",
       "extensions/renderer_permissions_policy_delegate.h",
       "extensions/resource_request_policy.cc",
       "extensions/resource_request_policy.h",
       "extensions/sync_file_system_custom_bindings.cc",
       "extensions/sync_file_system_custom_bindings.h",
-      "extensions/tabs_custom_bindings.cc",
-      "extensions/tabs_custom_bindings.h",
       "extensions/webstore_bindings.cc",
       "extensions/webstore_bindings.h",
       "media/cast_ipc_dispatcher.cc",
       "media/cast_ipc_dispatcher.h",
       "media/cast_receiver_audio_valve.cc",
       "media/cast_receiver_audio_valve.h",
       "media/cast_receiver_session.cc",
       "media/cast_receiver_session.h",
       "media/cast_receiver_session_delegate.cc",
       "media/cast_receiver_session_delegate.h",
@@ skipping 128 matching lines @@
     ]
   }
 
   if (is_android) {
     sources -= [
       "safe_browsing/mock_feature_extractor_clock.cc",
       "safe_browsing/mock_feature_extractor_clock.h",
     ]
   }
 }