Convert plugin and GPU process to brokered handle duplication.

content/common/gpu/media/dxva_video_decode_accelerator.h

Index: content/common/gpu/media/dxva_video_decode_accelerator.h
===================================================================
--- content/common/gpu/media/dxva_video_decode_accelerator.h	(revision 132263)
+++ content/common/gpu/media/dxva_video_decode_accelerator.h	(working copy)
@@ -39,9 +39,8 @@
   };
 
   // Does not take ownership of |client| which must outlive |*this|.
-  DXVAVideoDecodeAccelerator(
-      media::VideoDecodeAccelerator::Client* client,
-      base::ProcessHandle renderer_process);
+  explicit DXVAVideoDecodeAccelerator(
+      media::VideoDecodeAccelerator::Client* client);
   virtual ~DXVAVideoDecodeAccelerator();
 
   // media::VideoDecodeAccelerator implementation.
@@ -187,9 +186,6 @@
   // Contains the id of the last input buffer received from the client.
   int32 last_input_buffer_id_;
 
-  // Handle to the renderer process.
-  base::ProcessHandle renderer_process_;
-
   // Ideally the reset token would be a stack variable which is used while
   // creating the device manager. However it seems that the device manager
   // holds onto the token and attempts to access it if the underlying device