Return refererence from InlineBox::root()

Source/core/rendering/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 Apple Inc. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 410 matching lines @@
             return selectionTop;
     }
 
     return prevBottom;
 }
 
 LayoutUnit RootInlineBox::selectionTopAdjustedForPrecedingBlock() const
 {
     LayoutUnit top = selectionTop();
 
-    RenderObject::SelectionState blockSelectionState = root()->block().selectionState();
+    RenderObject::SelectionState blockSelectionState = root().block().selectionState();
     if (blockSelectionState != RenderObject::SelectionInside && blockSelectionState != RenderObject::SelectionEnd)
         return top;
 
     LayoutSize offsetToBlockBefore;
-    if (RenderBlock* block = root()->block().blockBeforeWithinSelectionRoot(offsetToBlockBefore)) {
+    if (RenderBlock* block = root().block().blockBeforeWithinSelectionRoot(offsetToBlockBefore)) {
         if (RootInlineBox* lastLine = block->lastRootBox()) {
             RenderObject::SelectionState lastLineSelectionState = lastLine->selectionState();
             if (lastLineSelectionState != RenderObject::SelectionInside && lastLineSelectionState != RenderObject::SelectionStart)
                 return top;
 
             LayoutUnit lastLineSelectionBottom = lastLine->selectionBottom() + offsetToBlockBefore.height();
             top = max(top, lastLineSelectionBottom);
         }
     }
 
@@ skipping 424 matching lines @@
 }
 
 #ifndef NDEBUG
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 #endif
 
 } // namespace WebCore