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

chrome/browser/predictors/resource_prefetch_predictor.cc

 // 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.
 
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <map>
 #include <set>
 #include <utility>
 
@@ skipping 99 matching lines @@
       const NavigationID& navigation_id,
       std::vector<URLRequestSummary>* requests,
       VisitInfoCallback callback)
       : visit_count_(0),
         navigation_id_(navigation_id),
         requests_(requests),
         callback_(callback) {
     DCHECK(requests_.get());
   }
 
-  virtual bool RunOnDBThread(history::HistoryBackend* backend,
-                             history::HistoryDatabase* db) override {
+  bool RunOnDBThread(history::HistoryBackend* backend,
+                     history::HistoryDatabase* db) override {
     history::URLRow url_row;
     if (db->GetRowForURL(navigation_id_.main_frame_url, &url_row))
       visit_count_ = url_row.visit_count();
     return true;
   }
 
-  virtual void DoneRunOnMainThread() override {
+  void DoneRunOnMainThread() override {
     callback_.Run(visit_count_, navigation_id_, *requests_);
   }
 
  private:
-  virtual ~GetUrlVisitCountTask() { }
+  ~GetUrlVisitCountTask() override {}
 
   int visit_count_;
   NavigationID navigation_id_;
   scoped_ptr<std::vector<URLRequestSummary> > requests_;
   VisitInfoCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GetUrlVisitCountTask);
 };
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 1071 matching lines @@
     RPP_PREDICTED_HISTOGRAM_PERCENTAGE(
         "PrefetchFromNetworkPercentOfTotalFromNetwork",
         prefetch_network * 100.0 / total_resources_fetched_from_network);
   }
 
 #undef RPP_PREDICTED_HISTOGRAM_PERCENTAGE
 #undef RPP_PREDICTED_HISTOGRAM_COUNTS
 }
 
 }  // namespace predictors