Bug 1242562 - Byte count rounding shouldn't depend on the decimal separator used. r=mak

Currently, download sizes on Fennec aren't rounded for locales using a "." as their decimal separator.

MozReview-Commit-ID: 54sBvTrNAln

--HG--
extra : transplant_source : %87%97%23W%7F%D2lQ%E7bYA5%AAa%A5%9BP%1FQ

toolkit/mozapps/downloads/DownloadUtils.jsm

@@ -486,9 +486,12 @@ this.DownloadUtils = {
       if (typeof Intl != "undefined") {
         aBytes = getLocaleNumberFormat(fractionDigits)
                    .format(aBytes);
-      } else if (gDecimalSymbol != ".") {
+      } else {
         // FIXME: Fall back to the old hack, will be fixed in bug 1200494.
-        aBytes = aBytes.toFixed(fractionDigits).replace(".", gDecimalSymbol);
+        aBytes = aBytes.toFixed(fractionDigits);
+        if (gDecimalSymbol != ".") {
+          aBytes = aBytes.replace(".", gDecimalSymbol);
+        }
       }
     }