Fix "unused variable" warnings.

chrome/browser/metrics/first_web_contents_profiler.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_METRICS_FIRST_WEB_CONTENTS_PROFILER_H_
 #define CHROME_BROWSER_METRICS_FIRST_WEB_CONTENTS_PROFILER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 59 matching lines @@
 
   // Whether an attempt was made to collect the "MainFrameLoad" metric.
   bool collected_load_metric_;
 
   // Whether an attempt was made to collect the "MainNavigationStart" metric.
   bool collected_main_navigation_start_metric_;
 
   // Whether an attempt was made to collect the "MainNavigationFinished" metric.
   bool collected_main_navigation_finished_metric_;
 
-  // Whether core metric collection is complete. Used to keep reporting old
-  // stats post abandon to give us an intra-milestone comparison basis initially
-  // between the old and new stats. TODO(gab): Remove this in M49.
-  bool finished_;
-
   DISALLOW_COPY_AND_ASSIGN(FirstWebContentsProfiler);
 };
 
 #endif  // CHROME_BROWSER_METRICS_FIRST_WEB_CONTENTS_PROFILER_H_