Switch line layout to LayoutUnit.

Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google 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
@@ skipping 87 matching lines @@
 };
 
 enum MapCoordinatesMode {
     IsFixed = 1 << 0,
     UseTransforms = 1 << 1,
     ApplyContainerFlip = 1 << 2,
     TraverseDocumentBoundaries = 1 << 3,
 };
 typedef unsigned MapCoordinatesFlags;
 
-const int caretWidth = 1;
+const LayoutUnit& caretWidth();
 
 struct AnnotatedRegionValue {
     bool operator==(const AnnotatedRegionValue& o) const
     {
         return draggable == o.draggable && bounds == o.bounds;
     }
 
     LayoutRect bounds;
     bool draggable;
 };
@@ skipping 1547 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h