Move LayoutObject::previousOffsetForBackwardDeletion() to editing.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 3214 matching lines @@
 
 int LayoutObject::caretMaxOffset() const
 {
     if (isAtomicInlineLevel())
         return node() ? std::max(1U, node()->countChildren()) : 1;
     if (isHR())
         return 1;
     return 0;
 }
 
-int LayoutObject::previousOffsetForBackwardDeletion(int current) const
-{
-    return current - 1;
-}
-
 bool LayoutObject::isInert() const
 {
     const LayoutObject* layoutObject = this;
     while (!layoutObject->node())
         layoutObject = layoutObject->parent();
     return layoutObject->node()->isInert();
 }
 
 void LayoutObject::imageChanged(ImageResource* image, const IntRect* rect)
 {
@@ skipping 464 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif