revert "SourceEventType added to LatencyInfo."

ui/events/blink/web_input_event_traits.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/blink/web_input_event_traits.h"
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 
 using base::StringAppendF;
@@ skipping 234 matching lines @@
 }
 
 uint32_t WebInputEventTraits::GetUniqueTouchEventId(
     const WebInputEvent& event) {
   if (WebInputEvent::isTouchEventType(event.type)) {
     return static_cast<const WebTouchEvent&>(event).uniqueTouchEventId;
   }
   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