Unobfuscate RWHVMac accelerated compositing code path by separating it from plugin code

content/browser/gpu/gpu_process_host_ui_shim.cc

Index: content/browser/gpu/gpu_process_host_ui_shim.cc
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.cc b/content/browser/gpu/gpu_process_host_ui_shim.cc
index 8608ee511354eafc528896272794f9a0816df2ef..945f6067cbf514d593f68d3e7d57e57cd1eaa712 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -202,7 +202,7 @@ bool GpuProcessHostUIShim::OnControlMessageReceived(
     IPC_MESSAGE_HANDLER(GpuHostMsg_ResizeView, OnResizeView)
 #endif
 
-#if defined(OS_MACOSX) || defined(USE_AURA)
+#if defined(USE_AURA)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceNew,
                         OnAcceleratedSurfaceNew)
 #endif
@@ -283,7 +283,7 @@ void GpuProcessHostUIShim::OnResizeView(int32 surface_id,
 
 #endif
 
-#if defined(OS_MACOSX) || defined(USE_AURA)
+#if defined(USE_AURA)
 
 void GpuProcessHostUIShim::OnAcceleratedSurfaceNew(
     const GpuHostMsg_AcceleratedSurfaceNew_Params& params) {
@@ -302,37 +302,8 @@ void GpuProcessHostUIShim::OnAcceleratedSurfaceNew(
   uint64 surface_handle = params.surface_handle;
   TransportDIB::Handle shm_handle = TransportDIB::DefaultHandleValue();
 
-#if defined(OS_MACOSX)
-  if (params.create_transport_dib) {
-    scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
-    if (shared_memory->CreateAnonymous(params.width * params.height * 4)) {
-      // Create a local handle for RWHVMac to map the SHM.
-      TransportDIB::Handle local_handle;
-      if (!shared_memory->ShareToProcess(0 /* pid, not needed */,
-                                         &local_handle)) {
-        return;
-      } else {
-        view->AcceleratedSurfaceSetTransportDIB(params.window,
-                                                params.width,
-                                                params.height,
-                                                local_handle);
-        // Create a remote handle for the GPU process to map the SHM.
-        if (!shared_memory->ShareToProcess(0 /* pid, not needed */,
-                                           &shm_handle)) {
-          return;
-        }
-      }
-    }
-  } else {
-    view->AcceleratedSurfaceSetIOSurface(params.window,
-                                         params.width,
-                                         params.height,
-                                         surface_handle);
-  }
-#else  // defined(USE_AURA)
   view->AcceleratedSurfaceNew(
       params.width, params.height, &surface_handle, &shm_handle);
-#endif
   delayed_send.Cancel();
   Send(new AcceleratedSurfaceMsg_NewACK(
       params.route_id, surface_handle, shm_handle));