Standardize usage of virtual/override/final specifiers.

ash/display/mirror_window_controller.cc

 // Copyright (c) 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.
 
 #include "ash/display/mirror_window_controller.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #include <X11/extensions/XInput2.h>
 
@@ skipping 40 matching lines @@
   evmask.deviceid = XIAllDevices;
   evmask.mask_len = sizeof(mask);
   evmask.mask = mask;
   XISelectEvents(gfx::GetXDisplay(), window, &evmask, 1);
 }
 #endif
 
 class NoneCaptureClient : public aura::client::CaptureClient {
  public:
   NoneCaptureClient() {}
-  virtual ~NoneCaptureClient() {}
+  ~NoneCaptureClient() override {}
 
  private:
   // Does a capture on the |window|.
-  virtual void SetCapture(aura::Window* window) override {}
+  void SetCapture(aura::Window* window) override {}
 
   // Releases a capture from the |window|.
-  virtual void ReleaseCapture(aura::Window* window) override {}
+  void ReleaseCapture(aura::Window* window) override {}
 
   // Returns the current capture window.
-  virtual aura::Window* GetCaptureWindow() override {
-    return NULL;
-  }
-  virtual aura::Window* GetGlobalCaptureWindow() override {
-    return NULL;
-  }
+  aura::Window* GetCaptureWindow() override { return NULL; }
+  aura::Window* GetGlobalCaptureWindow() override { return NULL; }
 
   DISALLOW_COPY_AND_ASSIGN(NoneCaptureClient);
 };
 
 }  // namespace
 
 MirrorWindowController::MirrorWindowController() {}
 
 MirrorWindowController::~MirrorWindowController() {
   // Make sure the root window gets deleted before cursor_window_delegate.
@@ skipping 95 matching lines @@
       display_manager->mirrored_display_id());
   const DisplayInfo& source_display_info = display_manager->GetDisplayInfo(
       Shell::GetScreen()->GetPrimaryDisplay().id());
   DCHECK(display_manager->IsMirrored());
   return scoped_ptr<RootWindowTransformer>(
       CreateRootWindowTransformerForMirroredDisplay(source_display_info,
                                                     mirror_display_info));
 }
 
 }  // namespace ash