Remove tr.b.identity.

tracing/tracing/ui/tracks/model_track.html

Index: tracing/tracing/ui/tracks/model_track.html
diff --git a/tracing/tracing/ui/tracks/model_track.html b/tracing/tracing/ui/tracks/model_track.html
index c58285e9b9f2ec9a1f8220e0752d4b904f9cabf8..a999099832701910e3a16c53e98b5b7ec76f7d7a 100644
--- a/tracing/tracing/ui/tracks/model_track.html
+++ b/tracing/tracing/ui/tracks/model_track.html
@@ -59,8 +59,8 @@ tr.exportTo('tr.ui.tracks', function() {
     if (times.length === 0) return [];
 
     // Find the lowest and highest index within the viewport.
-    const lowIndex =
-        tr.b.math.findLowIndexInSortedArray(times, tr.b.identity, minTime);
+    const lowIndex = tr.b.math.findLowIndexInSortedArray(
+        times, (x => x), minTime);
     let highIndex = lowIndex - 1;
     while (times[highIndex + 1] <= maxTime) {
       highIndex++;