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

content/browser/android/content_view_core_impl.cc

 // Copyright 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 "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 153 matching lines @@
 
 // Enables a callback when the underlying WebContents is destroyed, to enable
 // nulling the back-pointer.
 class ContentViewCoreImpl::ContentViewUserData
     : public base::SupportsUserData::Data {
  public:
   explicit ContentViewUserData(ContentViewCoreImpl* content_view_core)
       : content_view_core_(content_view_core) {
   }
 
-  virtual ~ContentViewUserData() {
+  ~ContentViewUserData() override {
     // TODO(joth): When chrome has finished removing the TabContents class (see
     // crbug.com/107201) consider inverting relationship, so ContentViewCore
     // would own WebContents. That effectively implies making the WebContents
     // destructor private on Android.
     delete content_view_core_;
   }
 
   ContentViewCoreImpl* get() const { return content_view_core_; }
 
  private:
@@ skipping 1196 matching lines @@
     return NULL;
 
   return view->GetJavaObject().Release();
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content