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

components/cronet/android/url_request_context_adapter.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 COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 #define COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 19 matching lines @@
 namespace cronet {
 
 struct URLRequestContextConfig;
 typedef base::Callback<void(void)> RunAfterContextInitTask;
 
 // Implementation of the Chromium NetLog observer interface.
 class NetLogObserver : public net::NetLog::ThreadSafeObserver {
  public:
   NetLogObserver() {}
 
-  virtual ~NetLogObserver() {}
+  ~NetLogObserver() override {}
 
   void OnAddEntry(const net::NetLog::Entry& entry) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NetLogObserver);
 };
 
 // Fully configured |URLRequestContext|.
 class URLRequestContextAdapter : public net::URLRequestContextGetter {
  public:
@@ skipping 63 matching lines @@
   // A queue of tasks that need to be run after context has been initialized.
   std::queue<RunAfterContextInitTask> tasks_waiting_for_context_;
   bool is_context_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextAdapter);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_