Make isEditablePosition to work with Position objects other than PositionIsOffsetInAnchor

Source/core/editing/htmlediting.cpp

Index: Source/core/editing/htmlediting.cpp
diff --git a/Source/core/editing/htmlediting.cpp b/Source/core/editing/htmlediting.cpp
index 6c7b309faf972a3ab3f1ef79fcc17fbb298bb8aa..8f6dc705a0a10a04d49eb72f9eef980eebb3b914 100644
--- a/Source/core/editing/htmlediting.cpp
+++ b/Source/core/editing/htmlediting.cpp
@@ -154,7 +154,7 @@ Node* lowestEditableAncestor(Node* node)
 
 bool isEditablePosition(const Position& p, EditableType editableType, EUpdateStyle updateStyle)
 {
-    Node* node = p.deprecatedNode();
+    Node* node = p.parentAnchoredEquivalent().deprecatedNode();

[Yuta Kitamura, 2014/06/06 08:55:07]

You should use anchorNode() instead of deprecatedNode(),
since we know it's parent-anchored.

[yosin_UTC9, 2014/06/06 09:26:11]

Done.

     if (!node)
         return false;
     if (updateStyle == UpdateStyle)