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

ppapi/shared_impl/ppb_view_shared.h

 // Copyright (c) 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPB_VIEW_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_VIEW_SHARED_H_
 
 #include "base/compiler_specific.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_size.h"
@@ skipping 18 matching lines @@
   float css_scale;
   PP_Point scroll_offset;
 };
 
 class PPAPI_SHARED_EXPORT PPB_View_Shared : public Resource,
                                             public thunk::PPB_View_API {
  public:
   PPB_View_Shared(ResourceObjectType type,
                   PP_Instance instance,
                   const ViewData& data);
-  virtual ~PPB_View_Shared();
+  ~PPB_View_Shared() override;
 
   // Resource overrides.
-  virtual thunk::PPB_View_API* AsPPB_View_API() override;
+  thunk::PPB_View_API* AsPPB_View_API() override;
 
   // PPB_View_API implementation.
-  virtual const ViewData& GetData() const override;
-  virtual PP_Bool GetRect(PP_Rect* viewport) const override;
-  virtual PP_Bool IsFullscreen() const override;
-  virtual PP_Bool IsVisible() const override;
-  virtual PP_Bool IsPageVisible() const override;
-  virtual PP_Bool GetClipRect(PP_Rect* clip) const override;
-  virtual float GetDeviceScale() const override;
-  virtual float GetCSSScale() const override;
-  virtual PP_Bool GetScrollOffset(PP_Point* scroll_offset) const override;
+  const ViewData& GetData() const override;
+  PP_Bool GetRect(PP_Rect* viewport) const override;
+  PP_Bool IsFullscreen() const override;
+  PP_Bool IsVisible() const override;
+  PP_Bool IsPageVisible() const override;
+  PP_Bool GetClipRect(PP_Rect* clip) const override;
+  float GetDeviceScale() const override;
+  float GetCSSScale() const override;
+  PP_Bool GetScrollOffset(PP_Point* scroll_offset) const override;
 
  private:
   ViewData data_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_View_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_VIEW_SHARED_H_