Change call-sites in trace viewer to use generators instead of iteration functions.

tracing/tracing/model/async_slice.html

Index: tracing/tracing/model/async_slice.html
diff --git a/tracing/tracing/model/async_slice.html b/tracing/tracing/model/async_slice.html
index 28aa8977f6d060c33637097acf401961ddac3fd7..325ef09d0a866a96620ce3215fe933654a486416 100644
--- a/tracing/tracing/model/async_slice.html
+++ b/tracing/tracing/model/async_slice.html
@@ -103,16 +103,13 @@ tr.exportTo('tr.model', function() {
           parentAsyncSliceGroup.slices.indexOf(this);
     },
 
-    findTopmostSlicesRelativeToThisSlice: function(eventPredicate, callback,
-                                                   opt_this) {
-      if (eventPredicate(this))
-        callback.call(opt_this, this);
-      else {
-        this.subSlices.forEach(function(s) {
-          s.findTopmostSlicesRelativeToThisSlice(eventPredicate, callback,
-                                                 opt_this);
-        });
+    findTopmostSlicesRelativeToThisSlice: function*(eventPredicate, opt_this) {
+      if (eventPredicate(this)) {
+        yield this;
+        return;
       }
+      for (var s of this.subSlices)
+        yield * s.findTopmostSlicesRelativeToThisSlice(eventPredicate);
     },
 
     findDescendentSlice: function(targetTitle) {