Don't allow updating tabs to javascript URLs without host

chrome/browser/extensions/extension_function_dispatcher.h

Index: chrome/browser/extensions/extension_function_dispatcher.h
diff --git a/chrome/browser/extensions/extension_function_dispatcher.h b/chrome/browser/extensions/extension_function_dispatcher.h
index 7a47b3f489630284f03ae4ac33a82182f4e53f8a..492c431e5b0f75442e1f052d0a4a051ee7ba1df2 100644
--- a/chrome/browser/extensions/extension_function_dispatcher.h
+++ b/chrome/browser/extensions/extension_function_dispatcher.h
@@ -13,6 +13,7 @@
 #include "googleurl/src/gurl.h"
 
 class Browser;
+class Extension;
 class ExtensionFunction;
 class ExtensionHost;
 class Profile;
@@ -74,6 +75,10 @@ class ExtensionFunctionDispatcher {
   // tab hosted extension pages, this will return NULL.
   ExtensionHost* GetExtensionHost();
 
+  // Gets the extension the function is being invoked by. This should not ever
+  // return NULL.
+  Extension* GetExtension();
+
   // Handle a malformed message.  Possibly the result of an attack, so kill
   // the renderer.
   void HandleBadMessage(ExtensionFunction* api);