Standardize usage of virtual/override/final specifiers.

ash/wm/gestures/overview_gesture_handler_unittest.cc

 // Copyright 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/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/overview/window_selector_controller.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 class OverviewGestureHandlerTest : public test::AshTestBase {
  public:
   OverviewGestureHandlerTest() {}
-  virtual ~OverviewGestureHandlerTest() {}
+  ~OverviewGestureHandlerTest() override {}
 
   aura::Window* CreateWindow(const gfx::Rect& bounds) {
     return CreateTestWindowInShellWithDelegate(&delegate_, -1, bounds);
   }
 
   bool IsSelecting() {
     return ash::Shell::GetInstance()->window_selector_controller()->
         IsSelecting();
   }
 
@@ skipping 132 matching lines @@
   scoped_ptr<aura::Window> window1(CreateWindow(bounds));
   scoped_ptr<aura::Window> window2(CreateWindow(bounds));
   ui::test::EventGenerator generator(root_window, window2.get());
   gfx::Point start_points[3];
   start_points[0] = start_points[1] = start_points[2] = gfx::Point(105, 105);
   generator.GestureMultiFingerScroll(3, start_points, 5, 10, 0, 100);
   EXPECT_FALSE(IsSelecting());
 }
 
 }  // namespace ash