Drop unnecessary ancestor traversal in Range::selectNode()

third_party/WebKit/Source/core/dom/Range.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1070 matching lines @@
         // FIXME: Generated bindings code never calls with null, and neither should other callers!
         exceptionState.throwTypeError("The node provided is null.");
         return;
     }
 
     if (!refNode->parentNode()) {
         exceptionState.throwDOMException(InvalidNodeTypeError, "the given Node has no parent.");
         return;
     }
 
-    // InvalidNodeTypeError: Raised if an ancestor of refNode is an Entity, Notation or
-    // DocumentType node or if refNode is a Document, DocumentFragment, ShadowRoot, Attr, Entity, or Notation
-    // node.
-    for (ContainerNode* anc = refNode->parentNode(); anc; anc = anc->parentNode()) {
-        switch (anc->nodeType()) {
-        case Node::ATTRIBUTE_NODE:
-        case Node::CDATA_SECTION_NODE:
-        case Node::COMMENT_NODE:
-        case Node::DOCUMENT_FRAGMENT_NODE:
-        case Node::DOCUMENT_NODE:
-        case Node::ELEMENT_NODE:
-        case Node::PROCESSING_INSTRUCTION_NODE:
-        case Node::TEXT_NODE:
-            break;
-        case Node::DOCUMENT_TYPE_NODE:
-            exceptionState.throwDOMException(InvalidNodeTypeError, "The node provided has an ancestor of type '" + anc->nodeName() + "'.");
-            return;
-        }
-    }
-
     switch (refNode->nodeType()) {
     case Node::CDATA_SECTION_NODE:
     case Node::COMMENT_NODE:
     case Node::DOCUMENT_TYPE_NODE:
     case Node::ELEMENT_NODE:
     case Node::PROCESSING_INSTRUCTION_NODE:
     case Node::TEXT_NODE:
         break;
     case Node::ATTRIBUTE_NODE:
     case Node::DOCUMENT_FRAGMENT_NODE:
@@ skipping 569 matching lines @@
 {
     if (range && range->boundaryPointsValid()) {
         range->startContainer()->showTreeAndMark(range->startContainer(), "S", range->endContainer(), "E");
         fprintf(stderr, "start offset: %d, end offset: %d\n", range->startOffset(), range->endOffset());
     } else {
         fprintf(stderr, "Cannot show tree if range is null, or if boundary points are invalid.\n");
     }
 }
 
 #endif