Standardize usage of virtual/override/final in cc/

cc/test/fake_content_layer_client.h

Index: cc/test/fake_content_layer_client.h
diff --git a/cc/test/fake_content_layer_client.h b/cc/test/fake_content_layer_client.h
index b74860d8489ce342b202c03f40c6857d1f8bfbd7..8f132843fc12b357781b754d4dc86a6e3ca3cc7f 100644
--- a/cc/test/fake_content_layer_client.h
+++ b/cc/test/fake_content_layer_client.h
@@ -25,14 +25,14 @@ class FakeContentLayerClient : public ContentLayerClient {
   };
 
   FakeContentLayerClient();
-  virtual ~FakeContentLayerClient();
+  ~FakeContentLayerClient() override;
 
-  virtual void PaintContents(
+  void PaintContents(
       SkCanvas* canvas,
       const gfx::Rect& rect,
       ContentLayerClient::GraphicsContextStatus gc_status) override;
-  virtual void DidChangeLayerCanUseLCDText() override {}
-  virtual bool FillsBoundsCompletely() const override;
+  void DidChangeLayerCanUseLCDText() override {}
+  bool FillsBoundsCompletely() const override;
 
   void set_fill_with_nonsolid_color(bool nonsolid) {
     fill_with_nonsolid_color_ = nonsolid;