Revert 115573 - Move Length and CSS length computation to float

LayoutTests/fast/dom/length-attribute-mapping.html

 <p>
     This tests the mapping of length-type attributes to CSS length values.
 </p>
 <pre id="console"></pre>
 <img id="img" style="display: none;">
 <table><col id="col" style="display: none;"></table>
 <script>
     if (window.layoutTestController)
         layoutTestController.dumpAsText();
 
@@ skipping 15 matching lines @@
     }
 
     var img = document.getElementById("img");
     log ("<img>:");
     test(img, "90zz", "90px");
     test(img, "80%", "80%");
     test(img, "70%5", "70%");
     test(img, "60%%", "60%");
     test(img, "50*");
     test(img, "40*5");
-    test(img, "30.5", "30.5px");
+    test(img, "30.5", "30px");
     log("");
 
     var col = document.getElementById("col");
     log ("<col>:");
     test(col, "90zz", "90px");
     test(col, "80%", "80%");
     test(col, "70%5", "70%");
     test(col, "60%%", "60%");
     test(col, "50*");
     test(col, "40*5");
-    test(col, "30.5", "30.5px");
+    test(col, "30.5", "30px");
 </script>