cc: Add DEFINE_ENUM macro.

cc/resources/tile_priority.cc

Index: cc/resources/tile_priority.cc
diff --git a/cc/resources/tile_priority.cc b/cc/resources/tile_priority.cc
index eeb87cdcbbc63d1ae89a74a9538961aac6eb74a1..cfa4733a010b81ac20c107db075a6d52d5b6ee89 100644
--- a/cc/resources/tile_priority.cc
+++ b/cc/resources/tile_priority.cc
@@ -68,11 +68,10 @@ scoped_ptr<base::Value> WhichTreeAsValue(WhichTree tree) {
   case PENDING_TREE:
       return scoped_ptr<base::Value>(base::Value::CreateStringValue(
           "PENDING_TREE"));
-  default:
-      DCHECK(false) << "Unrecognized WhichTree value " << tree;
-      return scoped_ptr<base::Value>(base::Value::CreateStringValue(
-          "<unknown WhichTree value>"));
   }
+  DCHECK(false) << "Unrecognized WhichTree value " << tree;
+  return scoped_ptr<base::Value>(base::Value::CreateStringValue(
+      "<unknown WhichTree value>"));
 }
 
 scoped_ptr<base::Value> TileResolutionAsValue(
@@ -157,11 +156,10 @@ scoped_ptr<base::Value> TileMemoryLimitPolicyAsValue(
   case ALLOW_ANYTHING:
       return scoped_ptr<base::Value>(base::Value::CreateStringValue(
           "ALLOW_ANYTHING"));
-  default:
-      DCHECK(false) << "Unrecognized policy value";
-      return scoped_ptr<base::Value>(base::Value::CreateStringValue(
-          "<unknown>"));
   }
+  DCHECK(false) << "Unrecognized policy value";
+  return scoped_ptr<base::Value>(base::Value::CreateStringValue(
+      "<unknown>"));
 }
 
 scoped_ptr<base::Value> TreePriorityAsValue(TreePriority prio) {