Revert of Delete base/prefs and update callers to use components.

extensions/shell/browser/shell_browser_main_parts.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_browser_main_parts.h"
 
 #include <string>
 
 #include "base/command_line.h"
+#include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "components/devtools_http_handler/devtools_http_handler.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "components/prefs/pref_service.h"
 #include "components/storage_monitor/storage_monitor.h"
 #include "components/update_client/update_query_params.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/context_factory.h"
 #include "content/public/common/result_codes.h"
 #include "content/shell/browser/shell_devtools_manager_delegate.h"
 #include "extensions/browser/app_window/app_window_client.h"
 #include "extensions/browser/browser_context_keyed_service_factories.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/updater/update_service.h"
@@ skipping 257 matching lines @@
 }
 
 void ShellBrowserMainParts::CreateExtensionSystem() {
   DCHECK(browser_context_);
   extension_system_ = static_cast<ShellExtensionSystem*>(
       ExtensionSystem::Get(browser_context_.get()));
   extension_system_->InitForRegularProfile(true);
 }
 
 }  // namespace extensions