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

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index a986bdbd330a17afc2eb082f550018355aaf2193..870783cf75dfb14e0a48beb4cd1c1e264c12374a 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -67,6 +67,10 @@ namespace gfx {
 class Range;
 }
 
+namespace gpu {
+struct Mailbox;
+}
+
 namespace content {
 
 class BrowserPluginHostFactory;
@@ -286,7 +290,7 @@ class CONTENT_EXPORT BrowserPluginGuest
   // BrowserPluginGuest is already destroyed.
   static void AcknowledgeBufferPresent(int route_id,
                                        int gpu_host_id,
-                                       const std::string& mailbox_name,
+                                       const gpu::Mailbox& mailbox,
                                        uint32 sync_point);
 
   // Returns whether BrowserPluginGuest is interested in receiving the given