Switch cc to std::unordered_*.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 1ddb5e812d3f83bda1e1f573ccfaf072c8f3023b..905b305ff6e1dafd9835a90507365912bbf3ebf9 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -10,6 +10,7 @@
 
 #include <set>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 #include "base/callback.h"
@@ -83,8 +84,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
                         public LayerAnimationValueObserver,
                         public LayerAnimationValueProvider {
  public:
-  typedef LayerList LayerListType;
-  typedef base::hash_map<int, scoped_refptr<Layer>> LayerIdMap;
+  using LayerListType = LayerList;
+  using LayerIdMap = std::unordered_map<int, scoped_refptr<Layer>>;
 
   enum LayerIdLabels {
     INVALID_ID = -1,