Switch line layout to LayoutUnit.

Source/core/layout/LayoutRubyBase.cpp

 /*
  * Copyright (C) 2009 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 116 matching lines @@
     }
     // Move all remaining children normally.
     moveChildrenTo(toBase, firstChild(), beforeChild);
 }
 
 ETextAlign LayoutRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
 {
     return JUSTIFY;
 }
 
-void LayoutRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
+void LayoutRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, LayoutUnit& logicalLeft, LayoutUnit& logicalWidth) const
 {
     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
     if (maxPreferredLogicalWidth >= logicalWidth)
         return;
 
     // Inset the ruby base by half the inter-ideograph expansion amount.
-    float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
+    LayoutUnit inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
 
     logicalLeft += inset / 2;
     logicalWidth -= inset;
 }
 
 } // namespace blink