Correct the UMA histogram name

BUG=352654

Review URL: https://codereview.chromium.org/547653002

Cr-Commit-Position: refs/heads/master@{#293533}

ui/events/gesture_detection/gesture_touch_uma_histogram.cc

@@ -43,7 +43,7 @@ void GestureTouchUMAHistogram::RecordTouchEvent(const MotionEvent& event) {
           50);
 
       base::TimeDelta duration = event.GetEventTime() - start_time_;
-      UMA_HISTOGRAM_TIMES("Event.TouchDuration2", duration);
+      UMA_HISTOGRAM_TIMES("Event.TouchDuration", duration);
     }
     is_single_finger_ = false;
   }