base::Bind: Implement a 1-arity CancelableCallback and use this to implement

chrome/browser/renderer_host/offline_resource_handler.h

Index: chrome/browser/renderer_host/offline_resource_handler.h
diff --git a/chrome/browser/renderer_host/offline_resource_handler.h b/chrome/browser/renderer_host/offline_resource_handler.h
index b28d5f78d8da35b8c7475cb828af922bb1e176b3..fc51dc081a0405db6d3010aeae338becef2a1f64 100644
--- a/chrome/browser/renderer_host/offline_resource_handler.h
+++ b/chrome/browser/renderer_host/offline_resource_handler.h
@@ -80,8 +80,7 @@ class OfflineResourceHandler : public ResourceHandler {
   int deferred_request_id_;
   GURL deferred_url_;
 
-  scoped_refptr<net::CancelableOldCompletionCallback<OfflineResourceHandler> >
-      appcache_completion_callback_;
+  net::CancelableCompletionCallback appcache_completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflineResourceHandler);
 };