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

components/native_viewport/platform_viewport_android.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 COMPONENTS_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_ANDROID_H_
 #define COMPONENTS_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_ANDROID_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/native_viewport/platform_viewport.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/sequential_id_generator.h"
 
 namespace gpu {
 class GLInProcessContext;
 }
 
 struct ANativeWindow;
 
 namespace native_viewport {
 
 class PlatformViewportAndroid : public PlatformViewport {
  public:
   static bool Register(JNIEnv* env);
 
   explicit PlatformViewportAndroid(Delegate* delegate);
-  virtual ~PlatformViewportAndroid();
+  ~PlatformViewportAndroid() override;
 
   void Destroy(JNIEnv* env, jobject obj);
   void SurfaceCreated(JNIEnv* env, jobject obj, jobject jsurface);
   void SurfaceDestroyed(JNIEnv* env, jobject obj);
   void SurfaceSetSize(JNIEnv* env,
                       jobject obj,
                       jint width,
                       jint height,
                       jfloat density);
   bool TouchEvent(JNIEnv* env,
@@ skipping 10 matching lines @@
                   jfloat h_wheel,
                   jfloat v_wheel);
   bool KeyEvent(JNIEnv* env,
                 jobject obj,
                 bool pressed,
                 jint key_code,
                 jint unicode_character);
 
  private:
   // Overridden from PlatformViewport:
-  virtual void Init(const gfx::Rect& bounds) override;
-  virtual void Show() override;
-  virtual void Hide() override;
-  virtual void Close() override;
-  virtual gfx::Size GetSize() override;
-  virtual void SetBounds(const gfx::Rect& bounds) override;
+  void Init(const gfx::Rect& bounds) override;
+  void Show() override;
+  void Hide() override;
+  void Close() override;
+  gfx::Size GetSize() override;
+  void SetBounds(const gfx::Rect& bounds) override;
 
   void ReleaseWindow();
 
   Delegate* const delegate_;
   JavaObjectWeakGlobalRef java_platform_viewport_android_;
   ANativeWindow* window_;
   mojo::ViewportMetricsPtr metrics_;
   ui::SequentialIDGenerator id_generator_;
 
   base::WeakPtrFactory<PlatformViewportAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformViewportAndroid);
 };
 
 }  // namespace native_viewport
 
 #endif  // COMPONENTS_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_ANDROID_H_