Clear opener when frame is detached.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 89d55678ff7d6f26ed137803c28d2265c307216c..ecc46846fb43d824cc7afebc4be673cf2ff3ff28 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -532,6 +532,8 @@ WebRemoteFrame* WebLocalFrameImpl::toWebRemoteFrame() {
 }
 
 void WebLocalFrameImpl::close() {
+  WebLocalFrame::close();
+
   m_client = nullptr;
 
   if (m_devToolsAgent)
@@ -1561,8 +1563,6 @@ DEFINE_TRACE(WebLocalFrameImpl) {
   visitor->trace(m_textFinder);
   visitor->trace(m_printContext);
   visitor->trace(m_contextMenuNode);
-  visitor->template registerWeakMembers<WebFrame, &WebFrame::clearWeakFrames>(
-      this);
   WebFrame::traceFrames(visitor, this);
   WebFrameImplBase::trace(visitor);
 }