Fix message routing for BrowserPlugin in iframe

content/public/renderer/browser_plugin_delegate.h

Index: content/public/renderer/browser_plugin_delegate.h
diff --git a/content/public/renderer/browser_plugin_delegate.h b/content/public/renderer/browser_plugin_delegate.h
index 282adda24a47510931e68fde57ac1244955039b5..011011ee541e6c1311012724ad267c50c926a930 100644
--- a/content/public/renderer/browser_plugin_delegate.h
+++ b/content/public/renderer/browser_plugin_delegate.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "content/common/content_export.h"
+#include "ipc/ipc_message.h"
 
 namespace content {
 
@@ -33,6 +34,10 @@ class CONTENT_EXPORT BrowserPluginDelegate {
   // Sets the instance ID that idenfies the plugin within current render
   // process.
   virtual void SetElementInstanceID(int element_instance_id) {}
+
+  // Called when a message is received.  Returns true iff the message was
+  // handled.
+  virtual bool OnMessageReceived(const IPC::Message& message);
 };
 
 }  // namespace content