Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/webstore_standalone_installer.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/webstore_standalone_installer.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/webstore_data_fetcher.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_prefs.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "url/gurl.h"
 
 using content::WebContents;
 
 namespace extensions {
 
 const char kInvalidWebstoreItemId[] = "Invalid Chrome Web Store item ID";
 const char kWebstoreRequestError[] =
     "Could not fetch data from the Chrome Web Store";
@@ skipping 294 matching lines @@
   // Balanced in InstallUIAbort or indirectly in InstallUIProceed via
   // OnExtensionInstallSuccess or OnExtensionInstallFailure.
   AddRef();
 
   install_ui_ = CreateInstallUI();
   install_ui_->ConfirmStandaloneInstall(
       this, localized_extension_for_display_.get(), &icon_, *install_prompt_);
 }
 
 }  // namespace extensions