Update {virtual,override} to follow C++11 style in chrome.

chrome/test/base/ui_test_utils.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 CHROME_TEST_BASE_UI_TEST_UTILS_H_
 #define CHROME_TEST_BASE_UI_TEST_UTILS_H_
 
 #include <map>
 #include <queue>
 #include <set>
@@ skipping 201 matching lines @@
   // Fills |details| with the details of the notification received for |source|.
   bool GetDetailsFor(uintptr_t source, U* details) {
     typename std::map<uintptr_t, U>::const_iterator iter =
         details_.find(source);
     if (iter == details_.end())
       return false;
     *details = iter->second;
     return true;
   }
 
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override {
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override {
     const U* details_ptr = content::Details<U>(details).ptr();
     if (details_ptr)
       details_[source.map_key()] = *details_ptr;
     content::WindowedNotificationObserver::Observe(type, source, details);
   }
 
  private:
   std::map<uintptr_t, U> details_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowedNotificationObserverWithDetails);
@@ skipping 58 matching lines @@
   std::vector<GURL> urls_;
 
   base::CancelableTaskTracker tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryEnumerator);
 };
 
 }  // namespace ui_test_utils
 
 #endif  // CHROME_TEST_BASE_UI_TEST_UTILS_H_