Change PluginWindowHandle type to be bool on Mac

content/child/plugin_messages.h

Index: content/child/plugin_messages.h
diff --git a/content/child/plugin_messages.h b/content/child/plugin_messages.h
index 3a97d10b39b3efe8a2e228fc8d348144bb2e1cc0..bd4b3ea99fdff778cb028b84c5a2e0157bd4c266 100644
--- a/content/child/plugin_messages.h
+++ b/content/child/plugin_messages.h
@@ -223,12 +223,6 @@ IPC_MESSAGE_ROUTED2(PluginMsg_WindowFrameChanged,
 
 IPC_MESSAGE_ROUTED1(PluginMsg_ImeCompositionCompleted,
                     base::string16 /* text */)
-
-// This message, used only on 10.6 and later, transmits the "fake"
-// window handle allocated by the browser on behalf of the renderer
-// to the GPU plugin.
-IPC_MESSAGE_ROUTED1(PluginMsg_SetFakeAcceleratedSurfaceWindowHandle,
-                    gfx::PluginWindowHandle /* window */)
 #endif
 
 //-----------------------------------------------------------------------------