Simplify WebUI data sources. Currently WebUI data sources implement a URLDataSourceDelegate interfa…

chrome/browser/ui/webui/session_favicon_source.cc

Index: chrome/browser/ui/webui/session_favicon_source.cc
===================================================================
--- chrome/browser/ui/webui/session_favicon_source.cc	(revision 176942)
+++ chrome/browser/ui/webui/session_favicon_source.cc	(working copy)
@@ -52,7 +52,7 @@
     scoped_refptr<base::RefCountedString> response =
         new base::RefCountedString();
     response->data() = favicon_data;
-    url_data_source()->SendResponse(request.request_id, response);
+    request.callback.Run(response);
     return true;
   }
   return false;