Revert 186627

content/renderer/browser_plugin/browser_plugin_manager_impl.h

Index: content/renderer/browser_plugin/browser_plugin_manager_impl.h
===================================================================
--- content/renderer/browser_plugin/browser_plugin_manager_impl.h	(revision 186756)
+++ content/renderer/browser_plugin/browser_plugin_manager_impl.h	(working copy)
@@ -16,10 +16,6 @@
 class Point;
 }
 
-namespace gpu {
-struct Mailbox;
-}
-
 namespace content {
 
 class BrowserPluginManagerImpl : public BrowserPluginManager {
@@ -50,7 +46,7 @@
   void OnUnhandledSwap(const IPC::Message& message,
                        int instance_id,
                        const gfx::Size& size,
-                       gpu::Mailbox mailbox_name,
+                       std::string mailbox_name,
                        int gpu_route_id,
                        int gpu_host_id);