Make SVG elements not to consider editable.

Source/core/dom/Position.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 847 matching lines @@
     if (renderer->style()->visibility() != VISIBLE)
         return false;
 
     if (renderer->isBR())
         // FIXME: The condition should be m_anchorType == PositionIsBeforeAnchor, but for now we still need to support legacy positions.
         return !m_offset && m_anchorType != PositionIsAfterAnchor && !nodeIsUserSelectNone(deprecatedNode()->parentNode());
 
     if (renderer->isText())
         return !nodeIsUserSelectNone(deprecatedNode()) && inRenderedText();
 
+    if (renderer->isSVG()) {
+        // We don't consider SVG elements are contenteditable except for
+        // associated renderer returns isText() true, e.g. RenderSVGInlineText.
+        return false;
+    }
+
     if (isRenderedTableElement(deprecatedNode()) || editingIgnoresContent(deprecatedNode()))
         return (atFirstEditingPositionForNode() || atLastEditingPositionForNode()) && !nodeIsUserSelectNone(deprecatedNode()->parentNode());
 
     if (isHTMLHtmlElement(*m_anchorNode))
         return false;
 
     if (renderer->isRenderBlockFlow()) {
         if (toRenderBlock(renderer)->logicalHeight() || isHTMLBodyElement(*m_anchorNode)) {
             if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(renderer))
                 return atFirstEditingPositionForNode() && !Position::nodeIsUserSelectNone(deprecatedNode());
@@ skipping 486 matching lines @@
     pos.showTreeForThis();
 }
 
 void showTree(const WebCore::Position* pos)
 {
     if (pos)
         pos->showTreeForThis();
 }
 
 #endif