[Android] Short-circuit touch forwarding when no touch handlers exist

content/browser/renderer_host/input/web_input_event_builders_android.cc

 // Copyright 2013 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 "content/browser/renderer_host/input/web_input_event_builders_android.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/input/motion_event_android.h"
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 #include "content/browser/renderer_host/input/web_input_event_util_posix.h"
@@ skipping 115 matching lines @@
 
   result.type = type;
   result.x = x;
   result.y = y;
   result.timeStampSeconds = time_sec;
   result.sourceDevice = WebGestureEvent::Touchscreen;
 
   return result;
 }
 
-blink::WebTouchEvent WebTouchEventBuilder::Build(
-    const MotionEventAndroid& event,
-    float scale) {
-  return CreateWebTouchEventFromMotionEvent(event, scale);
-}
-
 }  // namespace content