Adds a TransportDIB::Id value that is explicitly invalid and use it when compositing

content/plugin/webplugin_accelerated_surface_proxy_mac.cc

Index: content/plugin/webplugin_accelerated_surface_proxy_mac.cc
diff --git a/content/plugin/webplugin_accelerated_surface_proxy_mac.cc b/content/plugin/webplugin_accelerated_surface_proxy_mac.cc
index 7f5d486c1bdca7bc0fe666247e7db86a9d726918..ec4571db7cab820e2fc1abcf316268bfaf4ca80a 100644
--- a/content/plugin/webplugin_accelerated_surface_proxy_mac.cc
+++ b/content/plugin/webplugin_accelerated_surface_proxy_mac.cc
@@ -51,7 +51,7 @@ void WebPluginAcceleratedSurfaceProxy::SetSize(const gfx::Size& size) {
     plugin_proxy_->SetAcceleratedSurface(window_handle_, size, io_surface_id);
   } else {
     TransportDIB::Handle transport_dib = surface_->SetTransportDIBSize(size);
-    if (TransportDIB::is_valid(transport_dib)) {
+    if (TransportDIB::is_valid_handle(transport_dib)) {
       plugin_proxy_->SetAcceleratedDIB(window_handle_, size, transport_dib);
     }
   }