Change datause ascriber url destroyed to not create new recorder

New datause recorder should created only in OnBeforeUrlRequest.
OnUrlRequestDestroyed should not create a new recorder and immediately
delete it.

Bug: 781189
Change-Id: Iba78e7e7db913f71c76884ae8c66616fdfad9f8b
Reviewed-on: https://chromium-review.googlesource.com/775475Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: rajendrant <rajendrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517232}

components/data_use_measurement/core/data_use_ascriber.cc

@@ -49,7 +49,7 @@ void DataUseAscriber::OnUrlRequestCompleted(const net::URLRequest& request,
                                             bool started) {}
 
 void DataUseAscriber::OnUrlRequestDestroyed(net::URLRequest* request) {
-  DataUseRecorder* recorder = GetOrCreateDataUseRecorder(request);
+  DataUseRecorder* recorder = GetDataUseRecorder(*request);
   if (recorder)
     recorder->OnUrlRequestDestroyed(request);
 }