Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

chrome/browser/renderer_host/pepper/pepper_flash_drm_host.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/renderer_host/pepper/pepper_flash_drm_host.h"
 
 #if defined(OS_WIN)
 #include <Windows.h>
 #endif
 
@@ skipping 66 matching lines @@
     if (!rwh)
       return;
     content::RenderWidgetHostView* view = rwh->GetView();
     if (!view)
       return;
     gfx::NativeView native_view = view->GetNativeView();
 #if defined(USE_AURA)
     aura::WindowEventDispatcher* dispatcher = native_view->GetDispatcher();
     if (!dispatcher)
       return;
-    HWND window = dispatcher->GetAcceleratedWidget();
+    HWND window = dispatcher->host()->GetAcceleratedWidget();
 #else
     HWND window = native_view;
 #endif
     HMONITOR monitor = ::MonitorFromWindow(window, MONITOR_DEFAULTTONULL);
     InterlockedExchangePointer(reinterpret_cast<void* volatile *>(&monitor_),
                                monitor);
   }
 
   const int process_id_;
   const int render_id_;
@@ skipping 79 matching lines @@
   if (id.empty() && result == PP_OK) {
     NOTREACHED();
     result = PP_ERROR_FAILED;
   }
   reply_context.params.set_result(result);
   host()->SendReply(reply_context,
                     PpapiPluginMsg_FlashDRM_GetDeviceIDReply(id));
 }
 
 }  // namespace chrome