cc: Add DEFINE_ENUM macro.

cc/resources/raster_mode.cc

Index: cc/resources/raster_mode.cc
diff --git a/cc/resources/raster_mode.cc b/cc/resources/raster_mode.cc
index 47d6344c97d8b41731aa169a4c8a3ded2723575f..dfcc961afc030bcc9b28a503e748581b58fd75a9 100644
--- a/cc/resources/raster_mode.cc
+++ b/cc/resources/raster_mode.cc
@@ -21,11 +21,10 @@ scoped_ptr<base::Value> RasterModeAsValue(RasterMode raster_mode) {
     case LOW_QUALITY_RASTER_MODE:
       return scoped_ptr<base::Value>(
           base::Value::CreateStringValue("LOW_QUALITY_RASTER_MODE"));
-    default:
-      NOTREACHED() << "Unrecognized RasterMode value " << raster_mode;
-      return scoped_ptr<base::Value>(
-          base::Value::CreateStringValue("<unknown RasterMode value>"));
   }
+  NOTREACHED() << "Unrecognized RasterMode value " << raster_mode;
+  return scoped_ptr<base::Value>(
+      base::Value::CreateStringValue("<unknown RasterMode value>"));
 }
 
 }  // namespace cc