Remove one thread hop while fetching matching rules

chrome/browser/android/data_usage/external_data_use_observer_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/data_usage/external_data_use_observer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 576 matching lines @@
 
 // Tests if the metrics are recorded correctly.
 TEST_F(ExternalDataUseObserverTest, DataUseReportTimedOut) {
   base::HistogramTester histogram_tester;
   std::map<std::string, std::string> variation_params;
   variation_params["data_report_submit_timeout_msec"] = "0";
   variation_params["data_use_report_min_bytes"] = "0";
 
   // Create another ExternalDataUseObserver object.
   ReplaceExternalDataUseObserver(variation_params);
+  histogram_tester.ExpectTotalCount(kUMAMatchingRuleFirstFetchDurationHistogram,
+                                    0);
 
   // Trigger the control app install, and matching rules will be fetched.
   external_data_use_observer()
       ->GetDataUseTabModel()
       ->OnControlAppInstallStateChange(true);
   base::RunLoop().RunUntilIdle();
   histogram_tester.ExpectTotalCount(kUMAMatchingRuleFirstFetchDurationHistogram,
                                     1);
 
   // Verify that matching rules are fetched on every navigation after the
@@ skipping 15 matching lines @@
       ExternalDataUseObserver::DATAUSAGE_REPORT_SUBMISSION_TIMED_OUT, 1);
   histogram_tester.ExpectUniqueSample(
       "DataUsage.ReportSubmission.Bytes.TimedOut",
       default_upload_bytes() + default_download_bytes(), 1);
   histogram_tester.ExpectTotalCount(kUMAReportSubmissionDurationHistogram, 0);
 }
 
 }  // namespace android
 
 }  // namespace chrome