cancel overlay-scrollbar hover state when moving pointer out of window for ChromeOS

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 81b1d09911abf69a624d484dda6ed4121f5aea52..01d2544ceebb997e47f6822a2eea07fb510480f0 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -405,6 +405,11 @@ InputHandlerProxy::EventDisposition InputHandlerProxy::HandleInputEvent(
       input_handler_->MouseMoveAt(gfx::Point(mouse_event.x, mouse_event.y));
       return DID_NOT_HANDLE;
     }
+    case WebInputEvent::MouseLeave: {
+      CHECK(input_handler_);
+      input_handler_->MouseLeave();
+      return DID_NOT_HANDLE;
+    }
 
     default:
       if (WebInputEvent::isKeyboardEventType(event.type)) {