Standardize usage of virtual/override/final in extensions/

extensions/renderer/event_bindings.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 EXTENSIONS_RENDERER_EVENT_BINDINGS_H_
 #define EXTENSIONS_RENDERER_EVENT_BINDINGS_H_
 
 #include "extensions/renderer/object_backed_native_handler.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace extensions {
 class Dispatcher;
 class EventFilter;
 class EventFilteringInfo;
 class EventMatcher;
 
 // This class deals with the javascript bindings related to Event objects.
 class EventBindings : public ObjectBackedNativeHandler {
  public:
   EventBindings(Dispatcher* dispatcher, ScriptContext* context);
-  virtual ~EventBindings();
+  ~EventBindings() override;
 
  private:
   // Attach an event name to an object.
   // |event_name| The name of the event to attach.
   void AttachEvent(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // Detach an event name from an object.
   // |event_name| The name of the event to stop listening to.
   // |is_manual| True if this detach was done by the user via removeListener()
   // as opposed to automatically during shutdown, in which case we should inform
@@ skipping 16 matching lines @@
   void MatchAgainstEventFilter(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   Dispatcher* dispatcher_;
   scoped_ptr<EventMatcher> ParseEventMatcher(
       base::DictionaryValue* filter_dict);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EVENT_BINDINGS_H_