Convert plugin and GPU process to brokered handle duplication.

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
===================================================================
--- content/common/gpu/gpu_channel.cc	(revision 132263)
+++ content/common/gpu/gpu_channel.cc	(working copy)
@@ -40,8 +40,6 @@
                        bool software)
     : gpu_channel_manager_(gpu_channel_manager),
       client_id_(client_id),
-      renderer_process_(base::kNullProcessHandle),
-      renderer_pid_(base::kNullProcessId),
       share_group_(share_group ? share_group : new gfx::GLShareGroup),
       watchdog_(watchdog),
       software_(software),
@@ -62,10 +60,6 @@
 }
 
 GpuChannel::~GpuChannel() {
-#if defined(OS_WIN)
-  if (renderer_process_)
-    CloseHandle(renderer_process_);
-#endif
 }
 
 bool GpuChannel::OnMessageReceived(const IPC::Message& message) {
@@ -113,10 +107,6 @@
   gpu_channel_manager_->RemoveChannel(client_id_);
 }
 
-void GpuChannel::OnChannelConnected(int32 peer_pid) {
-  renderer_pid_ = peer_pid;
-}
-
 bool GpuChannel::Send(IPC::Message* message) {
   // The GPU process must never send a synchronous IPC message to the renderer
   // process. This could result in deadlock.
@@ -211,7 +201,6 @@
   // here. This is so the reply can be delayed if the scheduler is unscheduled.
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuChannel, msg)
-    IPC_MESSAGE_HANDLER(GpuChannelMsg_Initialize, OnInitialize)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuChannelMsg_CreateOffscreenCommandBuffer,
                                     OnCreateOffscreenCommandBuffer)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuChannelMsg_DestroyCommandBuffer,
@@ -312,15 +301,6 @@
   return num_contexts_preferring_discrete_gpu_ > 0;
 }
 
-void GpuChannel::OnInitialize(base::ProcessHandle renderer_process) {
-  // Initialize should only happen once.
-  DCHECK(!renderer_process_);
-
-  // Verify that the renderer has passed its own process handle.
-  if (base::GetProcId(renderer_process) == renderer_pid_)
-    renderer_process_ = renderer_process;
-}
-
 void GpuChannel::OnCreateOffscreenCommandBuffer(
     const gfx::Size& size,
     const GPUCreateCommandBufferConfig& init_params,