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

ui/display/chromeos/x11/native_display_event_dispatcher_x11_unittest.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 <X11/extensions/Xrandr.h>
 
 #undef Bool
 #undef None
 
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 42 matching lines @@
 DisplaySnapshotX11* CreateInternalOutput(RROutput output, RRCrtc crtc) {
   return CreateOutput(0,
                       DISPLAY_CONNECTION_TYPE_INTERNAL,
                       output,
                       crtc);
 }
 
 class TestHelperDelegate : public NativeDisplayDelegateX11::HelperDelegate {
  public:
   TestHelperDelegate();
-  virtual ~TestHelperDelegate();
+  ~TestHelperDelegate() override;
 
   int num_calls_update_xrandr_config() const {
     return num_calls_update_xrandr_config_;
   }
 
   int num_calls_notify_observers() const { return num_calls_notify_observers_; }
 
   void set_cached_outputs(const std::vector<DisplaySnapshot*>& outputs) {
     cached_outputs_ = outputs;
   }
 
   // NativeDisplayDelegateX11::HelperDelegate overrides:
-  virtual void UpdateXRandRConfiguration(const base::NativeEvent& event)
-      override;
-  virtual const std::vector<DisplaySnapshot*>& GetCachedDisplays() const
-      override;
-  virtual void NotifyDisplayObservers() override;
+  void UpdateXRandRConfiguration(const base::NativeEvent& event) override;
+  const std::vector<DisplaySnapshot*>& GetCachedDisplays() const override;
+  void NotifyDisplayObservers() override;
 
  private:
   int num_calls_update_xrandr_config_;
   int num_calls_notify_observers_;
 
   std::vector<DisplaySnapshot*> cached_outputs_;
 
   DISALLOW_COPY_AND_ASSIGN(TestHelperDelegate);
 };
 
@@ skipping 15 matching lines @@
 void TestHelperDelegate::NotifyDisplayObservers() {
   ++num_calls_notify_observers_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeDisplayEventDispatcherX11Test
 
 class NativeDisplayEventDispatcherX11Test : public testing::Test {
  public:
   NativeDisplayEventDispatcherX11Test();
-  virtual ~NativeDisplayEventDispatcherX11Test();
+  ~NativeDisplayEventDispatcherX11Test() override;
 
  protected:
   void DispatchScreenChangeEvent();
   void DispatchOutputChangeEvent(RROutput output,
                                  RRCrtc crtc,
                                  RRMode mode,
                                  bool connected);
 
   int xrandr_event_base_;
   scoped_ptr<TestHelperDelegate> helper_delegate_;
@@ skipping 193 matching lines @@
   outputs.clear();
   outputs.push_back(CreateOutput(0, DISPLAY_CONNECTION_TYPE_UNKNOWN, 2, 11));
   helper_delegate_->set_cached_outputs(outputs.get());
 
   // External display should be updated if the id is zero.
   DispatchOutputChangeEvent(2, 11, 20, true);
   EXPECT_EQ(1, helper_delegate_->num_calls_notify_observers());
 }
 
 }  // namespace ui