Removed toHexString().

It's not needed, as the 'int' class has various formatting functions.
These functions can even be called on constants, if you trick the compiler
a little bit by wrapping them in parens:

    trace("hex: " + (4097).toString(16));


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4522 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/StringUtil.as

@@ -170,18 +170,6 @@ public class StringUtil
         return array;
     }
 
-    /**
-     * Return a hex string representation of the specified value.
-     */
-    public static function toHexString (value :uint) :String
-    {
-        var str :String = "";
-        for (var x :int = 0; x < 8; x++) {
-            str = HEX[(value >> (x * 4)) & 0xF] + str;
-        }
-        return "0x" + str;
-    }
-
     /**
      * Generates a string from the supplied bytes that is the hex encoded
      * representation of those byts. Returns the empty String for a