revert "SourceEventType added to LatencyInfo."

ui/events/blink/web_input_event_traits.cc

Index: ui/events/blink/web_input_event_traits.cc
diff --git a/ui/events/blink/web_input_event_traits.cc b/ui/events/blink/web_input_event_traits.cc
index 58d95c9e2f3d75c41e38644a9ce096f60c813cea..8bfe69cec873c2152b0975558a78380b9e8d76f1 100644
--- a/ui/events/blink/web_input_event_traits.cc
+++ b/ui/events/blink/web_input_event_traits.cc
@@ -252,18 +252,4 @@ uint32_t WebInputEventTraits::GetUniqueTouchEventId(
   return 0U;
 }
 
-// static
-LatencyInfo WebInputEventTraits::CreateLatencyInfoForWebGestureEvent(
-    WebGestureEvent event) {
-  SourceEventType source_event_type = SourceEventType::UNKNOWN;
-  if (event.sourceDevice == blink::WebGestureDevice::WebGestureDeviceTouchpad) {
-    source_event_type = SourceEventType::WHEEL;
-  } else if (event.sourceDevice ==
-             blink::WebGestureDevice::WebGestureDeviceTouchscreen) {
-    source_event_type = SourceEventType::TOUCH;
-  }
-  LatencyInfo latency_info(source_event_type);
-  return latency_info;
-}
-
 }  // namespace ui