Added some methods to abstract inline text boxes.

third_party/WebKit/Source/core/layout/line/AbstractInlineTextBox.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
     g_abstract_inline_text_box_map_->erase(inline_text_box);
   }
 }
 
 AbstractInlineTextBox::~AbstractInlineTextBox() {
   DCHECK(!line_layout_item_);
   DCHECK(!inline_text_box_);
 }
 
 void AbstractInlineTextBox::Detach() {
-  if (Node* node = line_layout_item_.GetNode()) {
+  if (Node* node = GetNode()) {
     if (AXObjectCache* cache = node->GetDocument().ExistingAXObjectCache())
       cache->Remove(this);
   }
 
   line_layout_item_ = LineLayoutText(nullptr);
   inline_text_box_ = nullptr;
 }
 
 PassRefPtr<AbstractInlineTextBox> AbstractInlineTextBox::NextInlineTextBox()
     const {
@@ skipping 124 matching lines @@
 
   InlineBox* previous = inline_text_box_->PrevOnLine();
   if (previous && previous->IsInlineTextBox())
     return GetOrCreate(ToInlineTextBox(previous)->GetLineLayoutItem(),
                        ToInlineTextBox(previous));
 
   return nullptr;
 }
 
 }  // namespace blink