Allow app_shell embedders to override extensions client interfaces

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 "base/command_line.h"
 #include "base/run_loop.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/omaha_client/omaha_query_params.h"
@@ skipping 121 matching lines @@
   storage_monitor::StorageMonitor::Create();
 
   desktop_controller_.reset(browser_main_delegate_->CreateDesktopController());
 
   // NOTE: Much of this is culled from chrome/test/base/chrome_test_suite.cc
   // TODO(jamescook): Initialize user_manager::UserManager.
   net_log_.reset(new content::ShellNetLog("app_shell"));
 
   device_client_.reset(new ShellDeviceClient);
 
-  extensions_client_.reset(new ShellExtensionsClient());
+  extensions_client_.reset(CreateExtensionsClient());
   ExtensionsClient::Set(extensions_client_.get());
 
   extensions_browser_client_.reset(
-      new ShellExtensionsBrowserClient(browser_context_.get()));
+      CreateExtensionsBrowserClient(browser_context_.get()));
   ExtensionsBrowserClient::Set(extensions_browser_client_.get());
 
   omaha_query_params_delegate_.reset(new ShellOmahaQueryParamsDelegate);
   omaha_client::OmahaQueryParams::SetDelegate(
       omaha_query_params_delegate_.get());
 
   // Create our custom ExtensionSystem first because other
   // KeyedServices depend on it.
   // TODO(yoz): Move this after EnsureBrowserContextKeyedServiceFactoriesBuilt.
   CreateExtensionSystem();
@@ skipping 84 matching lines @@
 void ShellBrowserMainParts::PostDestroyThreads() {
 #if defined(OS_CHROMEOS)
   audio_controller_.reset();
   chromeos::CrasAudioHandler::Shutdown();
   network_controller_.reset();
   chromeos::NetworkHandler::Shutdown();
   chromeos::DBusThreadManager::Shutdown();
 #endif
 }
 
+ExtensionsClient* ShellBrowserMainParts::CreateExtensionsClient() {
+  return new ShellExtensionsClient();
+}
+
+ExtensionsBrowserClient* ShellBrowserMainParts::CreateExtensionsBrowserClient(
+    content::BrowserContext* context) {
+  return new ShellExtensionsBrowserClient(context);
+}
+
 void ShellBrowserMainParts::CreateExtensionSystem() {
   DCHECK(browser_context_);
   extension_system_ = static_cast<ShellExtensionSystem*>(
       ExtensionSystem::Get(browser_context_.get()));
   extension_system_->InitForRegularProfile(true);
 }
 
 }  // namespace extensions