Use gpu::Mailbox in IPCs instead of std::string

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 4237e4950f938a2fc6a041c279935c444cdadf11..1d19b16126fd09993fb59246a6ba318db214df2f 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -322,10 +322,6 @@ void GpuProcessHostUIShim::OnAcceleratedSurfaceBuffersSwapped(
       new AcceleratedSurfaceMsg_BufferPresented(params.route_id,
                                                 ack_params));
 
-  if (!params.mailbox_name.empty() &&
-      params.mailbox_name.length() != GL_MAILBOX_SIZE_CHROMIUM)
-    return;
-
   RenderWidgetHostViewPort* view = GetRenderWidgetHostViewFromSurfaceID(
       params.surface_id);
   if (!view)
@@ -354,10 +350,6 @@ void GpuProcessHostUIShim::OnAcceleratedSurfacePostSubBuffer(
       new AcceleratedSurfaceMsg_BufferPresented(params.route_id,
                                                 ack_params));
 
-  if (!params.mailbox_name.empty() &&
-      params.mailbox_name.length() != GL_MAILBOX_SIZE_CHROMIUM)
-    return;
-
   RenderWidgetHostViewPort* view =
       GetRenderWidgetHostViewFromSurfaceID(params.surface_id);
   if (!view)