Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/system_indicator/system_indicator_manager.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/api/system_indicator/system_indicator_manager.h"
 
 #include "base/memory/linked_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/status_icons/status_icon.h"
 #include "chrome/browser/status_icons/status_icon_observer.h"
 #include "chrome/browser/status_icons/status_tray.h"
 #include "chrome/common/extensions/api/system_indicator.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "ui/gfx/image/image.h"
 
 namespace extensions {
 
 namespace system_indicator = api::system_indicator;
 
 // Observes clicks on a given status icon and forwards the event to the
 // appropriate extension.  Handles icon updates, and responsible for creating
 // and removing the icon from the notification area during construction and
@@ skipping 171 matching lines @@
   if (extension_icon)
     system_indicators_[extension->id()] = make_linked_ptr(extension_icon);
 }
 
 void SystemIndicatorManager::RemoveIndicator(const std::string& extension_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   system_indicators_.erase(extension_id);
 }
 
 }  // namespace extensions