Standardize usage of virtual/override/final in cc/

cc/output/direct_renderer.h

Index: cc/output/direct_renderer.h
diff --git a/cc/output/direct_renderer.h b/cc/output/direct_renderer.h
index d4c4ba6800201fa439855d50d687bafa99c6c04b..4966e63674157079b20df5dad7c9c0138b0b504f 100644
--- a/cc/output/direct_renderer.h
+++ b/cc/output/direct_renderer.h
@@ -23,16 +23,16 @@ class ResourceProvider;
 // delegate rendering to another compositor.
 class CC_EXPORT DirectRenderer : public Renderer {
  public:
-  virtual ~DirectRenderer();
+  ~DirectRenderer() override;
 
-  virtual void DecideRenderPassAllocationsForFrame(
+  void DecideRenderPassAllocationsForFrame(
       const RenderPassList& render_passes_in_draw_order) override;
-  virtual bool HasAllocatedResourcesForTesting(RenderPassId id) const override;
-  virtual void DrawFrame(RenderPassList* render_passes_in_draw_order,
-                         float device_scale_factor,
-                         const gfx::Rect& device_viewport_rect,
-                         const gfx::Rect& device_clip_rect,
-                         bool disable_picture_quad_image_filtering) override;
+  bool HasAllocatedResourcesForTesting(RenderPassId id) const override;
+  void DrawFrame(RenderPassList* render_passes_in_draw_order,
+                 float device_scale_factor,
+                 const gfx::Rect& device_viewport_rect,
+                 const gfx::Rect& device_clip_rect,
+                 bool disable_picture_quad_image_filtering) override;
 
   struct CC_EXPORT DrawingFrame {
     DrawingFrame();