Remove DOMWindowProperty::willDetachGlobalObjectFromFrame

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

Index: third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp
diff --git a/third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp b/third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp
index 6fc921dde4b0173080f791206a402c60a694b5b8..91337808fcf307eef5d9b96aefc438364840c6b9 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp
@@ -52,13 +52,6 @@ void DOMWindowProperty::willDestroyGlobalObjectInFrame()
     m_frame = nullptr;
 }
 
-void DOMWindowProperty::willDetachGlobalObjectFromFrame()
-{
-    // If the property is getting this callback it must have been
-    // created with a LocalFrame and it should still have it.
-    ASSERT(m_frame);
-}
-
 DEFINE_TRACE(DOMWindowProperty)
 {
     visitor->trace(m_frame);