Remove WeakPtrs from DocumentTiming/DocumentLoadTiming

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 1083 matching lines @@
     String nodeName() const final;
     NodeType nodeType() const final;
     bool childTypeAllowed(NodeType) const final;
     PassRefPtrWillBeRawPtr<Node> cloneNode(bool deep = true) final;
     void cloneDataFromDocument(const Document&);
 
 #if !ENABLE(OILPAN)
     void refExecutionContext() final { ref(); }
     void derefExecutionContext() final { deref(); }
 #endif
-    WeakPtrWillBeRawPtr<Document> weakReference();
 
     const KURL& virtualURL() const final; // Same as url(), but needed for ExecutionContext to implement it without a performance loss for direct calls.
     KURL virtualCompleteURL(const String&) const final; // Same as completeURL() for the same reason as above.
 
     void reportBlockedScriptExecutionToInspector(const String& directiveText) final;
 
     double timerAlignmentInterval() const final;
 
     void updateTitle(const String&);
     void updateFocusAppearanceTimerFired(Timer<Document>*);
@@ skipping 306 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h