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

ui/events/android/scroller.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 UI_EVENTS_ANDROID_SCROLLER_H_
 #define UI_EVENTS_ANDROID_SCROLLER_H_
 
 #include "base/time/time.h"
 #include "ui/events/events_base_export.h"
 #include "ui/events/gesture_curve.h"
@@ skipping 10 matching lines @@
     Config();
 
     // Controls fling deceleration. Defaults to 0.015f.
     float fling_friction;
 
     // Controls fling accumulation. Defaults to disabled.
     bool flywheel_enabled;
   };
 
   explicit Scroller(const Config& config);
-  virtual ~Scroller();
+  ~Scroller() override;
 
   // GestureCurve implementation.
-  virtual bool ComputeScrollOffset(base::TimeTicks time,
-                                   gfx::Vector2dF* offset,
-                                   gfx::Vector2dF* velocity) override;
+  bool ComputeScrollOffset(base::TimeTicks time,
+                           gfx::Vector2dF* offset,
+                           gfx::Vector2dF* velocity) override;
 
   // Start scrolling by providing a starting point and the distance to travel.
   // The default value of 250 milliseconds will be used for the duration.
   void StartScroll(float start_x,
                    float start_y,
                    float dx,
                    float dy,
                    base::TimeTicks start_time);
 
   // Start scrolling by providing a starting point, the distance to travel,
@@ skipping 95 matching lines @@
   float distance_;
 
   float fling_friction_;
   float deceleration_;
   float tuning_coeff_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_ANDROID_SCROLLER_H_