Standardize usage of virtual/override/final specifiers.

ui/views/controls/button/blue_button_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 "ui/views/controls/button/blue_button.h"
 
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/test/views_test_base.h"
 
 namespace views {
 
 namespace {
 
 class TestBlueButton : public BlueButton {
  public:
   TestBlueButton() : BlueButton(NULL, base::ASCIIToUTF16("foo")) {}
-  virtual ~TestBlueButton() {}
+  ~TestBlueButton() override {}
 
   using BlueButton::OnNativeThemeChanged;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestBlueButton);
 };
 
 }  // namespace
 
 typedef ViewsTestBase BlueButtonTest;
@@ skipping 18 matching lines @@
   // Make sure it's still used after the native theme "changes".
   blue_button.OnNativeThemeChanged(NULL);
   gfx::Canvas canvas2(blue_button.bounds().size(), 1.0, true);
   blue_button.border()->Paint(blue_button, &canvas2);
 
   EXPECT_TRUE(gfx::BitmapsAreEqual(canvas.ExtractImageRep().sk_bitmap(),
                                    canvas2.ExtractImageRep().sk_bitmap()));
 }
 
 }  // namespace views