Update from https://crrev.com/309717

cc/resources/clip_display_item.h

Index: cc/resources/clip_display_item.h
diff --git a/cc/resources/clip_display_item.h b/cc/resources/clip_display_item.h
index 55c1ffdfeb0a96303b956eeb77ae2615ebee13ec..20603937e938b196e00b03a89f2801707532059a 100644
--- a/cc/resources/clip_display_item.h
+++ b/cc/resources/clip_display_item.h
@@ -20,7 +20,7 @@ namespace cc {
 
 class CC_EXPORT ClipDisplayItem : public DisplayItem {
  public:
-  virtual ~ClipDisplayItem();
+  ~ClipDisplayItem() override;
 
   static scoped_ptr<ClipDisplayItem> Create(
       gfx::Rect clip_rect,
@@ -45,7 +45,7 @@ class CC_EXPORT ClipDisplayItem : public DisplayItem {
 
 class CC_EXPORT EndClipDisplayItem : public DisplayItem {
  public:
-  virtual ~EndClipDisplayItem();
+  ~EndClipDisplayItem() override;
 
   static scoped_ptr<EndClipDisplayItem> Create() {
     return make_scoped_ptr(new EndClipDisplayItem());