Selection API: document.open() should reset Selection.

third_party/WebKit/Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 117 matching lines @@
   ScopedStyleResolver& ensureScopedStyleResolver();
   void clearScopedStyleResolver();
 
   SVGTreeScopeResources& ensureSVGTreeScopedResources();
 
  protected:
   TreeScope(ContainerNode&, Document&);
   TreeScope(Document&);
   virtual ~TreeScope();
 
+  void resetTreeScope();
   void setDocument(Document& document) { m_document = &document; }
   void setParentTreeScope(TreeScope&);
   void setNeedsStyleRecalcForViewportUnits();
 
  private:
   Member<ContainerNode> m_rootNode;
   Member<Document> m_document;
   Member<TreeScope> m_parentTreeScope;
 
   Member<DocumentOrderedMap> m_elementsById;
@@ skipping 24 matching lines @@
 
 HitTestResult hitTestInDocument(
     const Document*,
     int x,
     int y,
     const HitTestRequest& = HitTestRequest::ReadOnly | HitTestRequest::Active);
 
 }  // namespace blink
 
 #endif  // TreeScope_h