[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/extension_function.cc

Index: extensions/browser/extension_function.cc
diff --git a/extensions/browser/extension_function.cc b/extensions/browser/extension_function.cc
index 46e3ba136953c3f02df46ed287780e1c6b712e36..818c11f654b9185e857fcfe6dff624db7f2cf824 100644
--- a/extensions/browser/extension_function.cc
+++ b/extensions/browser/extension_function.cc
@@ -463,7 +463,7 @@ void UIThreadExtensionFunction::SetRenderFrameHost(
 content::WebContents* UIThreadExtensionFunction::GetAssociatedWebContents() {
   content::WebContents* web_contents = NULL;
   if (dispatcher())
-    web_contents = dispatcher()->delegate()->GetAssociatedWebContents();
+    web_contents = dispatcher()->GetAssociatedWebContents();
 
   return web_contents;
 }