[ESLint] Fix violations when enabling curly rule in eslint.

tracing/tracing/extras/chrome/cc/raster_task.html

Index: tracing/tracing/extras/chrome/cc/raster_task.html
diff --git a/tracing/tracing/extras/chrome/cc/raster_task.html b/tracing/tracing/extras/chrome/cc/raster_task.html
index af2e41f62c7a85765f96249d92cbe279b465c215..14818080ec33548d41cd88ed4e7ec2c1436e103a 100644
--- a/tracing/tracing/extras/chrome/cc/raster_task.html
+++ b/tracing/tracing/extras/chrome/cc/raster_task.html
@@ -29,22 +29,23 @@ tr.exportTo('tr.e.cc', function() {
   ];
 
   function getTileFromRasterTaskSlice(slice) {
-    if (!(isSliceDoingRasterization(slice) || isSliceDoingAnalysis(slice)))
+    if (!(isSliceDoingRasterization(slice) || isSliceDoingAnalysis(slice))) {
       return undefined;
+    }
 
     var tileData;
-    if (slice.args.data)
+    if (slice.args.data) {
       tileData = slice.args.data;
-    else
+    } else {
       tileData = slice.args.tileData;
-    if (tileData === undefined)
-      return undefined;
-    if (tileData.tile_id)
-      return tileData.tile_id;
+    }
+    if (tileData === undefined) return undefined;
+    if (tileData.tile_id) return tileData.tile_id;
 
     var tile = tileData.tileId;
-    if (!(tile instanceof tr.e.cc.TileSnapshot))
+    if (!(tile instanceof tr.e.cc.TileSnapshot)) {
       return undefined;
+    }
     return tileData.tileId;
   }