Fix crash when destroying a RenderWidgetHost that holds the pointer

content/browser/frame_host/cross_process_frame_connector.cc

Index: content/browser/frame_host/cross_process_frame_connector.cc
diff --git a/content/browser/frame_host/cross_process_frame_connector.cc b/content/browser/frame_host/cross_process_frame_connector.cc
index 2dd42ddd496727a10c357837480c3f8b74b7a314..1b5dafd2ba41898f8083bb60c4cd5047105a8379 100644
--- a/content/browser/frame_host/cross_process_frame_connector.cc
+++ b/content/browser/frame_host/cross_process_frame_connector.cc
@@ -201,6 +201,12 @@ bool CrossProcessFrameConnector::LockMouse() {
   return false;
 }
 
+void CrossProcessFrameConnector::UnlockMouse() {
+  RenderWidgetHostViewBase* root_view = GetRootRenderWidgetHostView();
+  if (root_view)
+    root_view->UnlockMouse();
+}
+
 void CrossProcessFrameConnector::OnForwardInputEvent(
     const blink::WebInputEvent* event) {
   if (!view_)