virtual/override specifier cleanup in ui/ (mostly Ozone code).

ui/gl/gl_surface_ozone.cc

 // 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 "ui/gl/gl_surface.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_context.h"
@@ skipping 42 matching lines @@
                             GLImage* image,
                             const Rect& bounds_rect,
                             const RectF& crop_rect) override {
     return image->ScheduleOverlayPlane(
         widget_, z_order, transform, bounds_rect, crop_rect);
   }
 
  private:
   using NativeViewGLSurfaceEGL::Initialize;
 
-  virtual ~GLSurfaceOzoneEGL() {
+  ~GLSurfaceOzoneEGL() override {
     Destroy();  // EGL surface must be destroyed before SurfaceOzone
   }
 
   bool ReinitializeNativeSurface() {
     scoped_ptr<ui::ScopedMakeCurrent> scoped_make_current;
     GLContext* current_context = GLContext::GetCurrent();
     bool was_current =
         current_context && current_context->IsCurrent(this);
     if (was_current) {
       scoped_make_current.reset(
@@ skipping 63 matching lines @@
   bool IsOffscreen() override { return false; }
   VSyncProvider* GetVSyncProvider() override { return vsync_provider_.get(); }
   bool SupportsPostSubBuffer() override { return true; }
   bool PostSubBuffer(int x, int y, int width, int height) override {
     // The actual sub buffer handling is handled at higher layers.
     SwapBuffers();
     return true;
   }
 
  private:
-  virtual ~GLSurfaceOzoneSurfaceless() {
+  ~GLSurfaceOzoneSurfaceless() override {
     Destroy();  // EGL surface must be destroyed before SurfaceOzone
   }
 
   // The native surface. Deleting this is allowed to free the EGLNativeWindow.
   scoped_ptr<ui::SurfaceOzoneEGL> ozone_surface_;
   AcceleratedWidget widget_;
   scoped_ptr<VSyncProvider> vsync_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOzoneSurfaceless);
 };
@@ skipping 87 matching lines @@
       NOTREACHED();
       return NULL;
   }
 }
 
 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
   return ui::SurfaceFactoryOzone::GetInstance()->GetNativeDisplay();
 }
 
 }  // namespace gfx