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

Source/core/layout/ImageQualityControllerTest.cpp

Index: Source/core/layout/ImageQualityControllerTest.cpp
diff --git a/Source/core/layout/ImageQualityControllerTest.cpp b/Source/core/layout/ImageQualityControllerTest.cpp
index 7a28624ae43b7f671bf69d625ac604a394c553ca..5e88c3d5347635e6879f8164f10c630d362df2a4 100644
--- a/Source/core/layout/ImageQualityControllerTest.cpp
+++ b/Source/core/layout/ImageQualityControllerTest.cpp
@@ -19,12 +19,12 @@ 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;