Remove the ContinuousMouseScrollBy function from eventsender

We have replaced ContinuousMouseScrollBy with
gpubenchmarking.smoothscrollbyXY to simulate scroll actions, now we can
remove it from eventsender.

Bug: 1047176
Change-Id: I770c2ba9a8a79f875d46be379ceec533b65e837d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361184Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800314}

content/shell/renderer/web_test/event_sender.cc

@@ -640,7 +640,6 @@ class EventSenderBindings : public gin::Wrappable<EventSenderBindings> {
   void GestureLongPress(gin::Arguments* args);
   void GestureLongTap(gin::Arguments* args);
   void GestureTwoFingerTap(gin::Arguments* args);
-  void ContinuousMouseScrollBy(gin::Arguments* args);
   void MouseMoveTo(gin::Arguments* args);
   void MouseLeave(gin::Arguments* args);
   void MouseScrollBy(gin::Arguments* args);
@@ -778,8 +777,6 @@ gin::ObjectTemplateBuilder EventSenderBindings::GetObjectTemplateBuilder(
       .SetMethod("gestureLongTap", &EventSenderBindings::GestureLongTap)
       .SetMethod("gestureTwoFingerTap",
                  &EventSenderBindings::GestureTwoFingerTap)
-      .SetMethod("continuousMouseScrollBy",
-                 &EventSenderBindings::ContinuousMouseScrollBy)
       .SetMethod("keyDown", &EventSenderBindings::KeyDown)
       .SetMethod("mouseDown", &EventSenderBindings::MouseDown)
       .SetMethod("mouseMoveTo", &EventSenderBindings::MouseMoveTo)
@@ -1021,11 +1018,6 @@ void EventSenderBindings::GestureTwoFingerTap(gin::Arguments* args) {
     sender_->GestureTwoFingerTap(frame_, args);
 }
 
-void EventSenderBindings::ContinuousMouseScrollBy(gin::Arguments* args) {
-  if (sender_)
-    sender_->MouseScrollBy(args, EventSender::MouseScrollType::PIXEL);
-}
-
 void EventSenderBindings::MouseMoveTo(gin::Arguments* args) {
   if (sender_)
     sender_->MouseMoveTo(frame_, args);