Don't drop mouse wheel events with phase ending information in RWHVCF.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 5fdd44e11742e0167429eb174f7a3bc8ff66b740..713a16075508a0a925afef0b4ad68bbe428397a8 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -488,7 +488,11 @@ void RenderWidgetHostViewChildFrame::ProcessMouseEvent(
 void RenderWidgetHostViewChildFrame::ProcessMouseWheelEvent(
     const blink::WebMouseWheelEvent& event,
     const ui::LatencyInfo& latency) {
-  if (event.delta_x != 0 || event.delta_y != 0)
+  if (event.delta_x != 0 || event.delta_y != 0 ||
+      event.phase == blink::WebMouseWheelEvent::kPhaseEnded ||
+      event.phase == blink::WebMouseWheelEvent::kPhaseCancelled ||
+      event.momentum_phase == blink::WebMouseWheelEvent::kPhaseEnded ||
+      event.momentum_phase == blink::WebMouseWheelEvent::kPhaseCancelled)
     host_->ForwardWheelEventWithLatencyInfo(event, latency);
 }