Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/ui/zoom/chrome_zoom_level_prefs.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
 #define CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/prefs/json_pref_store.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/pref_store.h"
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/zoom_level_delegate.h"
 
-class ZoomEventManager;
-
 namespace base {
 class DictionaryValue;
 }
 
+namespace extensions {
+class ZoomEventManager;
+}
+
 namespace chrome {
 
+using extensions::ZoomEventManager;
+
 // A class to manage per-partition default and per-host zoom levels in Chrome's
 // preference system. It implements an interface between the content/ zoom
 // levels in HostZoomMap and Chrome's preference system. All changes
 // to the per-partition default zoom levels from chrome/ flow through this
 // class. Any changes to per-host levels are updated when HostZoomMap calls
 // OnZoomLevelChanged.
 class ChromeZoomLevelPrefs : public content::ZoomLevelDelegate {
  public:
   typedef base::CallbackList<void(void)>::Subscription
       DefaultZoomLevelSubscription;
@@ skipping 34 matching lines @@
   scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
   std::string partition_key_;
   base::CallbackList<void(void)> default_zoom_changed_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeZoomLevelPrefs);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_