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 e2a2d3dbf525f63ef1234af00717d4fd81c0c7be..026c3e3efda1590a26bb9a4842945bdf4bda0314 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)) {