Update from https://crrev.com/309717

cc/resources/transparency_display_item.h

Index: cc/resources/transparency_display_item.h
diff --git a/cc/resources/transparency_display_item.h b/cc/resources/transparency_display_item.h
index 6766d91d2fde0ff9eb3d54e9d5cb3e9c914aa16b..d5417bc0bc26af8244961c8d119242cae5254a8a 100644
--- a/cc/resources/transparency_display_item.h
+++ b/cc/resources/transparency_display_item.h
@@ -19,7 +19,7 @@ namespace cc {
 
 class CC_EXPORT TransparencyDisplayItem : public DisplayItem {
  public:
-  virtual ~TransparencyDisplayItem();
+  ~TransparencyDisplayItem() override;
 
   static scoped_ptr<TransparencyDisplayItem> Create(
       float opacity,
@@ -43,7 +43,7 @@ class CC_EXPORT TransparencyDisplayItem : public DisplayItem {
 
 class CC_EXPORT EndTransparencyDisplayItem : public DisplayItem {
  public:
-  virtual ~EndTransparencyDisplayItem();
+  ~EndTransparencyDisplayItem() override;
 
   static scoped_ptr<EndTransparencyDisplayItem> Create() {
     return make_scoped_ptr(new EndTransparencyDisplayItem());