Create the D3D device with a NULL HWND instead of GetShellWindow in the decoder

content/common/gpu/media/dxva_video_decode_accelerator.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 "content/common/gpu/media/dxva_video_decode_accelerator.h"
 
 #if !defined(OS_WIN)
 #error This file should only be built on Windows.
 #endif   // !defined(OS_WIN)
 
@@ skipping 721 matching lines @@
     RETURN_ON_HR_FAILURE(hr,
         "QueryInterface for IDirect3DDevice9Ex from angle device failed",
         false);
   } else {
     D3DPRESENT_PARAMETERS present_params = {0};
     present_params.BackBufferWidth = 1;
     present_params.BackBufferHeight = 1;
     present_params.BackBufferFormat = D3DFMT_UNKNOWN;
     present_params.BackBufferCount = 1;
     present_params.SwapEffect = D3DSWAPEFFECT_DISCARD;
-    present_params.hDeviceWindow = ::GetShellWindow();
+    present_params.hDeviceWindow = NULL;
     present_params.Windowed = TRUE;
     present_params.Flags = D3DPRESENTFLAG_VIDEO;
     present_params.FullScreen_RefreshRateInHz = 0;
     present_params.PresentationInterval = 0;
 
     hr = d3d9_->CreateDeviceEx(D3DADAPTER_DEFAULT,
                                D3DDEVTYPE_HAL,
-                               ::GetShellWindow(),
+                               NULL,
                                D3DCREATE_FPU_PRESERVE |
                                D3DCREATE_HARDWARE_VERTEXPROCESSING |
                                D3DCREATE_DISABLE_PSGP_THREADING |
                                D3DCREATE_MULTITHREADED,
                                &present_params,
                                NULL,
                                d3d9_device_ex_.Receive());
     RETURN_ON_HR_FAILURE(hr, "Failed to create D3D device", false);
   }
 
@@ skipping 1523 matching lines @@
     D3DSURFACE_DESC surface_desc;
     hr = surface->GetDesc(&surface_desc);
     RETURN_ON_HR_FAILURE(hr, "Failed to get surface description", false);
     *width = surface_desc.Width;
     *height = surface_desc.Height;
   }
   return true;
 }
 
 }  // namespace content