Standardize usage of virtual/override/final in extensions/

extensions/browser/api/web_request/web_request_time_tracker.cc

 // 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.
 
 #include "extensions/browser/api/web_request/web_request_time_tracker.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
 #include "extensions/browser/warning_set.h"
@@ skipping 16 matching lines @@
 
 // If this many requests (of the past kMaxRequestsLogged) have had "too much"
 // delay, then we will warn the user.
 const size_t kNumModerateDelaysBeforeWarning = 50u;
 const size_t kNumExcessiveDelaysBeforeWarning = 10u;
 
 // Default implementation for ExtensionWebRequestTimeTrackerDelegate
 // that sets a warning in the extension service of |profile|.
 class DefaultDelegate : public ExtensionWebRequestTimeTrackerDelegate {
  public:
-  virtual ~DefaultDelegate() {}
+  ~DefaultDelegate() override {}
 
   // Implementation of ExtensionWebRequestTimeTrackerDelegate.
-  virtual void NotifyExcessiveDelays(
+  void NotifyExcessiveDelays(
       void* profile,
       size_t num_delayed_messages,
       size_t total_num_messages,
       const std::set<std::string>& extension_ids) override;
-  virtual void NotifyModerateDelays(
+  void NotifyModerateDelays(
       void* profile,
       size_t num_delayed_messages,
       size_t total_num_messages,
       const std::set<std::string>& extension_ids) override;
 };
 
 void DefaultDelegate::NotifyExcessiveDelays(
     void* profile,
     size_t num_delayed_messages,
     size_t total_num_messages,
@@ skipping 184 matching lines @@
   // When a request is redirected, we have no way of knowing how long the
   // request would have taken, so we can't say how much an extension slowed
   // down this request. Just ignore it.
   request_time_logs_.erase(request_id);
 }
 
 void ExtensionWebRequestTimeTracker::SetDelegate(
     ExtensionWebRequestTimeTrackerDelegate* delegate) {
   delegate_.reset(delegate);
 }