Standardize usage of virtual/override/final in content/

content/common/gpu/image_transport_surface_mac.mm

 // 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.
 
 #include "content/common/gpu/image_transport_surface_fbo_mac.h"
 
 #include "content/common/gpu/gpu_messages.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_osmesa.h"
 
 namespace content {
 namespace {
 
 // A subclass of GLSurfaceOSMesa that doesn't print an error message when
 // SwapBuffers() is called.
 class DRTSurfaceOSMesa : public gfx::GLSurfaceOSMesa {
  public:
   // Size doesn't matter, the surface is resized to the right size later.
   DRTSurfaceOSMesa()
       : GLSurfaceOSMesa(gfx::OSMesaSurfaceFormatRGBA, gfx::Size(1, 1)) {}
 
   // Implement a subset of GLSurface.
-  virtual bool SwapBuffers() override;
+  bool SwapBuffers() override;
 
  private:
-  virtual ~DRTSurfaceOSMesa() {}
+  ~DRTSurfaceOSMesa() override {}
   DISALLOW_COPY_AND_ASSIGN(DRTSurfaceOSMesa);
 };
 
 bool DRTSurfaceOSMesa::SwapBuffers() {
   return true;
 }
 
 bool g_allow_os_mesa = false;
 
 }  //  namespace
@@ skipping 26 matching lines @@
           manager, stub, surface.get()));
   }
 }
 
 // static
 void ImageTransportSurface::SetAllowOSMesaForTesting(bool allow) {
   g_allow_os_mesa = allow;
 }
 
 }  // namespace content