Fix bug where transient pages would miss events dispatched while it was

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index 60d2955e228c6701000f239d877dfe62db561c70..2f01eea20f20d02a100f3f09449e9148231fa118 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -189,6 +189,9 @@ class ExtensionHost : public content::WebContentsDelegate,
 
   // Message handlers.
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
+  void OnEventAck();
+  void OnIncrementLazyKeepaliveCount();
+  void OnDecrementLazyKeepaliveCount();
 
   // Handles keyboard events that were not handled by HandleKeyboardEvent().
   // Platform specific implementation may override this method to handle the