Standardize usage of virtual/override/final in gin/

gin/modules/timer.h

 // Copyright 2013 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 GIN_MODULES_TIMER_H_
 #define GIN_MODULES_TIMER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "gin/gin_export.h"
@@ skipping 11 matching lines @@
  public:
   enum TimerType {
     TYPE_ONE_SHOT,
     TYPE_REPEATING
   };
 
   static WrapperInfo kWrapperInfo;
   static Handle<Timer> Create(TimerType type, v8::Isolate* isolate,
                               int delay_ms, v8::Handle<v8::Function> function);
 
-  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(
-      v8::Isolate* isolate) override;
+  ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate) override;
 
  private:
   Timer(v8::Isolate* isolate, bool repeating, int delay_ms,
         v8::Handle<v8::Function> function);
-  virtual ~Timer();
+  ~Timer() override;
   void OnTimerFired();
 
   base::Timer timer_;
   base::WeakPtr<gin::Runner> runner_;
   base::WeakPtrFactory<Timer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Timer);
 };
 
 
 class GIN_EXPORT TimerModule : public Wrappable<TimerModule> {
  public:
   static const char kName[];
   static WrapperInfo kWrapperInfo;
   static Handle<TimerModule> Create(v8::Isolate* isolate);
   static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
 
  private:
   TimerModule();
-  virtual ~TimerModule();
+  ~TimerModule() override;
 
-  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(
-      v8::Isolate* isolate) override;
+  ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate) override;
 };
 
 }  // namespace gin
 
 #endif  // GIN_MODULES_TIMER_H_