Fix virtual/override/final usage in Source/core/layout/.

Source/core/layout/ImageQualityControllerTest.cpp

 // 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 "config.h"
 #include "core/layout/ImageQualityController.h"
 
 #include "core/layout/LayoutImage.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class ImageQualityControllerTest : public RenderingTest {
 protected:
     ImageQualityController* controller() { return m_controller; }
 
 private:
-    virtual void SetUp() override
+    void SetUp() override
     {
         m_controller = ImageQualityController::imageQualityController();
         RenderingTest::SetUp();
     }
-    virtual void TearDown() override
+    void TearDown() override
     {
     }
     ImageQualityController* m_controller;
 };
 
 TEST_F(ImageQualityControllerTest, RegularImage)
 {
     setBodyInnerHTML("<img src='myimage'></img>");
     LayoutObject* obj = document().body()->firstChild()->layoutObject();
 
@@ skipping 166 matching lines @@
     EXPECT_FALSE(mockTimer->isActive());
     // Painted at the same size, so even though timer is still executing, don't go to low quality.
     EXPECT_EQ(InterpolationLow, controller()->chooseInterpolationQuality(&context, img, testImage.get(), testImage.get(), LayoutSize(4, 4)));
     // Check that the timer was not kicked. It should not have been, since the image was painted at the same size as last time.
     EXPECT_FALSE(mockTimer->isActive());
 }
 
 #endif
 
 } // namespace blink