Split WarningService from ExtensionSystem.

extensions/shell/browser/shell_extension_system.cc

 // 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.
 
 #include "extensions/shell/browser/shell_extension_system.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 123 matching lines @@
 }
 
 LazyBackgroundTaskQueue* ShellExtensionSystem::lazy_background_task_queue() {
   return lazy_background_task_queue_.get();
 }
 
 EventRouter* ShellExtensionSystem::event_router() {
   return event_router_.get();
 }
 
-WarningService* ShellExtensionSystem::warning_service() {
-  return NULL;
-}
-
 Blacklist* ShellExtensionSystem::blacklist() {
   return NULL;
 }
 
 ErrorConsole* ShellExtensionSystem::error_console() {
   return NULL;
 }
 
 InstallVerifier* ShellExtensionSystem::install_verifier() {
   return NULL;
@@ skipping 33 matching lines @@
   return make_scoped_ptr(new ExtensionSet());
 }
 
 DeclarativeUserScriptMaster*
 ShellExtensionSystem::GetDeclarativeUserScriptMasterByExtension(
     const ExtensionId& extension_id) {
   return NULL;
 }
 
 }  // namespace extensions