Revert of [VSync Queue] Plug touch ack to gesture events and flush vsync queue if necessary

ui/events/blink/input_handler_proxy.cc

Index: ui/events/blink/input_handler_proxy.cc
diff --git a/ui/events/blink/input_handler_proxy.cc b/ui/events/blink/input_handler_proxy.cc
index 17cd8fd882173b3c80316d26dbee039390d227e4..6ff1983d7139c16be4b7604726a8c80db40dea7f 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -323,17 +323,6 @@
   }
 
   if (has_ongoing_compositor_scroll_fling_pinch_) {
-    const auto& gesture_event = ToWebGestureEvent(event_with_callback->event());
-    if (gesture_event.source_device == blink::kWebGestureDeviceTouchscreen &&
-        gesture_event.is_source_touch_event_set_non_blocking) {
-      // Dispatch immediately to avoid regression in
-      // |smoothness.tough_scrolling_cases:first_gesture_scroll_update_latency|.
-      compositor_event_queue_->Queue(std::move(event_with_callback),
-                                     tick_clock_->NowTicks());
-      DispatchQueuedInputEvents();
-      return;
-    }
-
     bool needs_animate_input = compositor_event_queue_->empty();
     compositor_event_queue_->Queue(std::move(event_with_callback),
                                    tick_clock_->NowTicks());