Revert: Change CaptureSynchronizer and PointerWatcherEventRouter to support multiple CaptureClients

ui/views/widget/desktop_aura/desktop_capture_client.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/observer_list.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/views/views_export.h"
 
 namespace aura {
 class RootWindow;
 }
 
 namespace views {
 
 // Desktop implementation of CaptureClient. There is one CaptureClient per
@@ skipping 28 matching lines @@
 
  private:
   typedef std::set<DesktopCaptureClient*> CaptureClients;
 
   aura::Window* root_;
   aura::Window* capture_window_;
 
   // Set of DesktopCaptureClients.
   static CaptureClients* capture_clients_;
 
-  base::ObserverList<aura::client::CaptureClientObserver> observers_;
-
   DISALLOW_COPY_AND_ASSIGN(DesktopCaptureClient);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_