Revert 241291 (Fix a leak in ResourceDispatcher on cancel).

content/child/resource_dispatcher.cc

Index: content/child/resource_dispatcher.cc
diff --git a/content/child/resource_dispatcher.cc b/content/child/resource_dispatcher.cc
index 456695cfbe9c43866a7b691b72bb5b436fc0c20a..ad80be7630978d52523d1cca9f2aee341d9e8d8b 100644
--- a/content/child/resource_dispatcher.cc
+++ b/content/child/resource_dispatcher.cc
@@ -588,8 +588,10 @@ void ResourceDispatcher::CancelPendingRequest(int request_id) {
     return;
   }
 
-  // |request_id| will be removed from |pending_requests_| when
-  // OnRequestComplete returns with ERR_ABORTED.
+  PendingRequestInfo& request_info = it->second;
+  ReleaseResourcesInMessageQueue(&request_info.deferred_message_queue);
+  pending_requests_.erase(it);
+
   message_sender()->Send(new ResourceHostMsg_CancelRequest(request_id));
 }