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

ash/touch/touchscreen_util_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 <string>
 #include <vector>
 
 #include "ash/display/display_info.h"
 #include "ash/touch/touchscreen_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/devices/input_device.h"
 
 namespace ash {
 
 class TouchscreenUtilTest : public testing::Test {
  public:
   TouchscreenUtilTest() {}
-  virtual ~TouchscreenUtilTest() {}
+  ~TouchscreenUtilTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     // Internal display will always match to internal touchscreen. If internal
     // touchscreen can't be detected, it is then associated to a touch screen
     // with matching size.
     {
       DisplayInfo display(1, std::string(), false);
       DisplayMode mode(gfx::Size(1920, 1080), 60.0, false, true);
       mode.native = true;
       std::vector<DisplayMode> modes(1, mode);
       display.SetDisplayModes(modes);
       displays_.push_back(display);
@@ skipping 18 matching lines @@
     {
       DisplayInfo display(4, std::string(), false);
       DisplayMode mode(gfx::Size(1024, 768), 60.0, false, true);
       mode.native = true;
       std::vector<DisplayMode> modes(1, mode);
       display.SetDisplayModes(modes);
       displays_.push_back(display);
     }
   }
 
-  virtual void TearDown() override {
-    displays_.clear();
-  }
+  void TearDown() override { displays_.clear(); }
 
  protected:
   std::vector<DisplayInfo> displays_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TouchscreenUtilTest);
 };
 
 TEST_F(TouchscreenUtilTest, NoTouchscreens) {
   std::vector<ui::TouchscreenDevice> devices;
@@ skipping 81 matching lines @@
   AssociateTouchscreens(&displays_, devices);
 
   // Internal touchscreen is always mapped to internal display.
   EXPECT_EQ(2u, displays_[0].touch_device_id());
   EXPECT_EQ(1u, displays_[1].touch_device_id());
   EXPECT_EQ(ui::TouchscreenDevice::kInvalidId, displays_[2].touch_device_id());
   EXPECT_EQ(ui::TouchscreenDevice::kInvalidId, displays_[3].touch_device_id());
 }
 
 }  // namespace ash