Fix crash when destroying a RenderWidgetHost that holds the pointer

content/browser/frame_host/interstitial_page_impl.cc

Index: content/browser/frame_host/interstitial_page_impl.cc
diff --git a/content/browser/frame_host/interstitial_page_impl.cc b/content/browser/frame_host/interstitial_page_impl.cc
index 036f3ea83dfeef00e0cfb1b00977b31ffbb91307..853bcb2faa254a47cc97b770c4b2f18da1fcae85 100644
--- a/content/browser/frame_host/interstitial_page_impl.cc
+++ b/content/browser/frame_host/interstitial_page_impl.cc
@@ -465,6 +465,11 @@ void InterstitialPageImpl::SelectAll() {
   RecordAction(base::UserMetricsAction("SelectAll"));
 }
 
+bool InterstitialPageImpl::HasMouseLock(
+    RenderWidgetHostImpl* render_widget_host) {
+  return false;
+}
+
 RenderViewHostDelegateView* InterstitialPageImpl::GetDelegateView() {
   return rvh_delegate_view_.get();
 }