Convert plugin and GPU process to brokered handle duplication.

content/browser/renderer_host/gpu_message_filter.cc

Index: content/browser/renderer_host/gpu_message_filter.cc
===================================================================
--- content/browser/renderer_host/gpu_message_filter.cc	(revision 132263)
+++ content/browser/renderer_host/gpu_message_filter.cc	(working copy)
@@ -173,31 +173,11 @@
 void GpuMessageFilter::EstablishChannelCallback(
     IPC::Message* reply,
     const IPC::ChannelHandle& channel,
-    base::ProcessHandle gpu_process_for_browser,
     const content::GPUInfo& gpu_info) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  base::ProcessHandle renderer_process_for_gpu;
-  if (gpu_process_for_browser != 0) {
-#if defined(OS_WIN)
-    // Create a process handle that the renderer process can give to the GPU
-    // process to give it access to its handles.
-    DuplicateHandle(base::GetCurrentProcessHandle(),
-                    peer_handle(),
-                    gpu_process_for_browser,
-                    &renderer_process_for_gpu,
-                    PROCESS_DUP_HANDLE,
-                    FALSE,
-                    0);
-#else
-    renderer_process_for_gpu = peer_handle();
-#endif
-  } else {
-    renderer_process_for_gpu = 0;
-  }
-
   GpuHostMsg_EstablishGpuChannel::WriteReplyParams(
-      reply, render_process_id_, channel, renderer_process_for_gpu, gpu_info);
+      reply, render_process_id_, channel, gpu_info);
   Send(reply);
 }