Standardize usage of virtual/override/final in content/browser/

content/browser/histogram_synchronizer.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
 #define CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 62 matching lines @@
   static void FetchHistogramsAsynchronously(base::MessageLoop* callback_thread,
                                             const base::Closure& callback,
                                             base::TimeDelta wait_time);
 
  private:
   friend struct DefaultSingletonTraits<HistogramSynchronizer>;
 
   class RequestContext;
 
   HistogramSynchronizer();
-  virtual ~HistogramSynchronizer();
+  ~HistogramSynchronizer() override;
 
   // Establish a new sequence number, and use it to notify all processes
   // (renderers, plugins, GPU, etc) of the need to supply, to the browser,
   // any/all changes to their histograms. |wait_time| specifies the amount of
   // time to wait before cancelling the requests for non-responsive processes.
   void RegisterAndNotifyAllProcesses(ProcessHistogramRequester requester,
                                      base::TimeDelta wait_time);
 
   // -------------------------------------------------------
   // HistogramSubscriber methods for browser child processes
   // -------------------------------------------------------
 
   // Update the number of pending processes for the given |sequence_number|.
   // This is called on UI thread.
-  virtual void OnPendingProcesses(int sequence_number,
-                                  int pending_processes,
-                                  bool end) override;
+  void OnPendingProcesses(int sequence_number,
+                          int pending_processes,
+                          bool end) override;
 
   // Send histogram_data back to caller and also record that we are waiting
   // for one less histogram data from child process for the given sequence
   // number. This method is accessible on UI thread.
-  virtual void OnHistogramDataCollected(
+  void OnHistogramDataCollected(
       int sequence_number,
       const std::vector<std::string>& pickled_histograms) override;
 
   // Set the callback_thread_ and callback_ members. If these members already
   // had values, then as a side effect, post the old callback_ to the old
   // callaback_thread_.  This side effect should not generally happen, but is in
   // place to assure correctness (that any tasks that were set, are eventually
   // called, and never merely discarded).
   void SetCallbackTaskAndThread(base::MessageLoop* callback_thread,
                                 const base::Closure& callback);
@@ skipping 29 matching lines @@
   // The sequence number used by the most recent asynchronous update request to
   // contact all processes.
   int async_sequence_number_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramSynchronizer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_