Standardize usage of virtual/override/final in ui/

ui/gl/gl_image_io_surface.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 UI_GL_GL_IMAGE_IO_SURFACE_H_
 #define UI_GL_GL_IMAGE_IO_SURFACE_H_
 
 #include <IOSurface/IOSurfaceAPI.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gl/gl_image.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageIOSurface : public GLImage {
  public:
   explicit GLImageIOSurface(const gfx::Size& size);
 
   bool Initialize(IOSurfaceRef io_surface);
 
   // Overridden from GLImage:
-  virtual void Destroy(bool have_context) override;
-  virtual gfx::Size GetSize() override;
-  virtual bool BindTexImage(unsigned target) override;
-  virtual void ReleaseTexImage(unsigned target) override {}
-  virtual bool CopyTexImage(unsigned target) override;
-  virtual void WillUseTexImage() override {}
-  virtual void DidUseTexImage() override {}
-  virtual void WillModifyTexImage() override {}
-  virtual void DidModifyTexImage() override {}
-  virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
-                                    int z_order,
-                                    OverlayTransform transform,
-                                    const Rect& bounds_rect,
-                                    const RectF& crop_rect) override;
+  void Destroy(bool have_context) override;
+  gfx::Size GetSize() override;
+  bool BindTexImage(unsigned target) override;
+  void ReleaseTexImage(unsigned target) override {}
+  bool CopyTexImage(unsigned target) override;
+  void WillUseTexImage() override {}
+  void DidUseTexImage() override {}
+  void WillModifyTexImage() override {}
+  void DidModifyTexImage() override {}
+  bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
+                            int z_order,
+                            OverlayTransform transform,
+                            const Rect& bounds_rect,
+                            const RectF& crop_rect) override;
 
  protected:
-  virtual ~GLImageIOSurface();
+  ~GLImageIOSurface() override;
 
  private:
   base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
   const gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageIOSurface);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_IO_SURFACE_H_