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 4e1a26e22d856cceb5e3ce3b67916020c1e4f868..1fa06e68972dc5594854cb180b23225d5e49e7f9 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -321,10 +321,6 @@ 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)
@@ -353,10 +349,6 @@ 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)