DevTools: Make functions on timeline tree view point to the right source location

Source/devtools/front_end/timeline/TimelineModel.js

Index: Source/devtools/front_end/timeline/TimelineModel.js
diff --git a/Source/devtools/front_end/timeline/TimelineModel.js b/Source/devtools/front_end/timeline/TimelineModel.js
index f56571beaca93a2f7be3daf91deda39217b872c2..d242cac7679a92d5fd47f3b0b6ad1d5ea5295c1d 100644
--- a/Source/devtools/front_end/timeline/TimelineModel.js
+++ b/Source/devtools/front_end/timeline/TimelineModel.js
@@ -1484,8 +1484,8 @@ WebInspector.TimelineModel.buildTopDownTree = function(events, startTime, endTim
             return false;
         if (WebInspector.TracingModel.isAsyncPhase(e.phase))
             return false;
-        for (var filter of filters) {
-            if (!filter.accept(e))
+        for (var i = 0, l = filters.length; i < l; ++i) {
+            if (!filters[i].accept(e))
                 return false;
         }
         return true;