Switch line layout to LayoutUnit.

Source/core/layout/LayoutBoxModelObject.cpp

Index: Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/Source/core/layout/LayoutBoxModelObject.cpp b/Source/core/layout/LayoutBoxModelObject.cpp
index a1c4e4474400ed203df6ee7e345912cc5a26177a..b82d053b67fbd5e03673e2ab8e59a7425c382031 100644
--- a/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/Source/core/layout/LayoutBoxModelObject.cpp
@@ -819,17 +819,17 @@ LayoutRect LayoutBoxModelObject::localCaretRectForEmptyElement(LayoutUnit width,
             x -= textIndentOffset / 2;
         break;
     case AlignRight:
-        x = maxX - caretWidth;
+        x = maxX - caretWidth();
         if (!currentStyle.isLeftToRightDirection())
             x -= textIndentOffset;
         break;
     }
-    x = std::min(x, std::max<LayoutUnit>(maxX - caretWidth, 0));
+    x = std::min(x, std::max<LayoutUnit>(maxX - caretWidth(), 0));
 
     LayoutUnit height = style()->fontMetrics().height();
     LayoutUnit verticalSpace = lineHeight(true, currentStyle.isHorizontalWritingMode() ? HorizontalLine : VerticalLine,  PositionOfInteriorLineBoxes) - height;
     LayoutUnit y = paddingTop() + borderTop() + (verticalSpace / 2);
-    return currentStyle.isHorizontalWritingMode() ? LayoutRect(x, y, caretWidth, height) : LayoutRect(y, x, height, caretWidth);
+    return currentStyle.isHorizontalWritingMode() ? LayoutRect(x, y, caretWidth(), height) : LayoutRect(y, x, height, caretWidth());
 }
 
 void LayoutBoxModelObject::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const