Fix virtual/override/final usage in the rest of Source/core/.

Source/core/paint/DisplayItemListPaintTest.cpp

Index: Source/core/paint/DisplayItemListPaintTest.cpp
diff --git a/Source/core/paint/DisplayItemListPaintTest.cpp b/Source/core/paint/DisplayItemListPaintTest.cpp
index f7667a2ace0e9e9ae24ba73cea91814d91ce216e..c3042c576fc38abb47bd0ad7ff8df73e99bc8803 100644
--- a/Source/core/paint/DisplayItemListPaintTest.cpp
+++ b/Source/core/paint/DisplayItemListPaintTest.cpp
@@ -35,7 +35,7 @@ protected:
     const DisplayItems& newPaintListBeforeUpdate() { return rootDisplayItemList().m_newDisplayItems; }
 
 private:
-    virtual void SetUp() override
+    void SetUp() override
     {
         RuntimeEnabledFeatures::setSlimmingPaintEnabled(true);
 
@@ -46,7 +46,7 @@ private:
         ASSERT_TRUE(m_layoutView);
     }
 
-    virtual void TearDown() override
+    void TearDown() override
     {
         RuntimeEnabledFeatures::setSlimmingPaintEnabled(m_originalSlimmingPaintEnabled);
     }
@@ -59,8 +59,8 @@ class TestDisplayItem : public DisplayItem {
 public:
     TestDisplayItem(const DisplayItemClientWrapper& client, Type type) : DisplayItem(client, type) { }
 
-    virtual void replay(GraphicsContext&) override final { ASSERT_NOT_REACHED(); }
-    virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override final { ASSERT_NOT_REACHED(); }
+    void replay(GraphicsContext&) final { ASSERT_NOT_REACHED(); }
+    void appendToWebDisplayItemList(WebDisplayItemList*) const final { ASSERT_NOT_REACHED(); }
 };
 
 #ifndef NDEBUG