Making LayoutUnit conversions to Float type explicit

Source/platform/geometry/LayoutSize.h

 /*
  * Copyright (c) 2012, 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 43 matching lines @@
 
     LayoutUnit width() const { return m_width; }
     LayoutUnit height() const { return m_height; }
 
     void setWidth(LayoutUnit width) { m_width = width; }
     void setHeight(LayoutUnit height) { m_height = height; }
 
     bool isEmpty() const { return m_width.rawValue() <= 0 || m_height.rawValue() <= 0; }
     bool isZero() const { return !m_width && !m_height; }
 
-    float aspectRatio() const { return static_cast<float>(m_width) / static_cast<float>(m_height); }
+    float aspectRatio() const { return m_width.toFloat() / m_height.toFloat(); }
 
     void expand(LayoutUnit width, LayoutUnit height)
     {
         m_width += width;
         m_height += height;
     }
 
     void shrink(LayoutUnit width, LayoutUnit height)
     {
         m_width -= width;
@@ skipping 110 matching lines @@
 }
 
 inline LayoutSize roundedLayoutSize(const FloatSize& s)
 {
     return LayoutSize(s);
 }
 
 } // namespace WebCore
 
 #endif // LayoutSize_h