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

ui/display/chromeos/test/test_display_snapshot.h

 // 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.
 
 #ifndef UI_DISPLAY_CHROMEOS_TEST_TEST_DISPLAY_SNAPSHOT_H_
 #define UI_DISPLAY_CHROMEOS_TEST_TEST_DISPLAY_SNAPSHOT_H_
 
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_snapshot.h"
 
 namespace ui {
 
 class DISPLAY_EXPORT TestDisplaySnapshot : public DisplaySnapshot {
  public:
   TestDisplaySnapshot();
   TestDisplaySnapshot(int64_t display_id,
                       const gfx::Point& origin,
                       const gfx::Size& physical_size,
                       DisplayConnectionType type,
                       bool is_aspect_preserving_scaling,
                       const std::vector<const DisplayMode*>& modes,
                       const DisplayMode* current_mode,
                       const DisplayMode* native_mode);
-  virtual ~TestDisplaySnapshot();
+  ~TestDisplaySnapshot() override;
 
   void set_type(DisplayConnectionType type) { type_ = type; }
   void set_modes(const std::vector<const DisplayMode*>& modes) {
     modes_ = modes;
   }
   void set_current_mode(const ui::DisplayMode* mode) { current_mode_ = mode; }
   void set_native_mode(const ui::DisplayMode* mode) { native_mode_ = mode; }
   void set_is_aspect_preserving_scaling(bool state) {
     is_aspect_preserving_scaling_ = state;
   }
   void set_display_id(int64_t id) { display_id_ = id; }
 
   // DisplaySnapshot overrides:
-  virtual std::string ToString() const override;
+  std::string ToString() const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestDisplaySnapshot);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_TEST_TEST_DISPLAY_SNAPSHOT_H_