Don't throttle disposed FrameViews

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 5cfb85f3f5f5fddc20055ed245de877eeb10987f..86b24e35e4c3bcb8bbd7fe26f4eedcfea11fb47e 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -170,9 +170,7 @@ FrameView::FrameView(LocalFrame* frame)
       m_needsUpdateWidgetGeometries(false),
       m_needsUpdateViewportIntersection(true),
       m_needsUpdateViewportIntersectionInSubtree(true),
-#if ENABLE(ASSERT)
       m_hasBeenDisposed(false),
-#endif
       m_horizontalScrollbarMode(ScrollbarAuto),
       m_verticalScrollbarMode(ScrollbarAuto),
       m_horizontalScrollbarLock(false),
@@ -319,9 +317,7 @@ void FrameView::dispose() {
   if (ownerElement && ownerElement->ownedWidget() == this)
     ownerElement->setWidget(nullptr);
 
-#if ENABLE(ASSERT)
   m_hasBeenDisposed = true;
-#endif
 }
 
 void FrameView::detachScrollbars() {
@@ -4473,6 +4469,8 @@ bool FrameView::shouldThrottleRendering() const {
 }
 
 bool FrameView::canThrottleRendering() const {
+  if (m_hasBeenDisposed)
+    return false;
   if (!RuntimeEnabledFeatures::renderingPipelineThrottlingEnabled())
     return false;
   return m_subtreeThrottled ||