Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

apps/shell/shell_browser_main_parts.cc

 // Copyright 2013 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 "apps/shell/shell_browser_main_parts.h"
 
 #include "apps/shell/shell_browser_context.h"
 #include "apps/shell/shell_extension_system.h"
 #include "apps/shell/shell_extensions_browser_client.h"
 #include "apps/shell/shell_extensions_client.h"
 #include "apps/shell/web_view_window.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/common/chrome_paths.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 #include "content/public/common/result_codes.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension_paths.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/base/ime/input_method_initializer.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/screen.h"
 #include "ui/wm/test/wm_test_helper.h"
 
 #if defined(OS_CHROMEOS)
@@ skipping 131 matching lines @@
 void ShellBrowserMainParts::DestroyRootWindow() {
   wm_test_helper_->root_window()->RemoveRootWindowObserver(this);
   wm_test_helper_->root_window()->PrepareForShutdown();
   wm_test_helper_.reset();
   ui::ShutdownInputMethodForTesting();
 }
 
 void ShellBrowserMainParts::CreateExtensionSystem() {
   DCHECK(browser_context_);
   extension_system_ = static_cast<ShellExtensionSystem*>(
-      ExtensionSystem::GetForBrowserContext(browser_context_.get()));
+      ExtensionSystem::Get(browser_context_.get()));
   extension_system_->InitForRegularProfile(true);
 }
 
 }  // namespace apps