FrameView: Don't try to update the throttling status of a deleted frame

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 88bfd295adafbfa2a186dd6f3f0695d5961b2976..45b694c42266bc05c49558fa66d95f778c3d964f 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -309,6 +309,8 @@ void FrameView::setupRenderThrottling() {
   m_visibilityObserver = new ElementVisibilityObserver(
       targetElement, WTF::bind(
                          [](FrameView* frameView, bool isVisible) {
+                           if (!frameView)
+                             return;
                            frameView->updateRenderThrottlingStatus(
                                !isVisible, frameView->m_subtreeThrottled);
                            frameView->maybeRecordLoadReason();