Bug 1231867: Remove use of the spread operator to support node 4.2. r=miker

--HG--
extra : commitid : 56RoXh2T8JM
extra : rebase_source : 1d55bfbb97a042168cc608bce84897bf5700b5a6

testing/eslint-plugin-mozilla/lib/processors/xbl-bindings.js

@@ -94,7 +94,7 @@ function reindent(text) {
   let indents = lines.filter(s => s.trim().length > 0)
                      .map(s => s.length - s.trimLeft().length);
   // Find the smallest indent level in use
-  let minIndent = Math.min(...indents);
+  let minIndent = Math.min.apply(null, indents);
 
   // Strip off the found indent level and prepend the new indent level, but only
   // if the string isn't already empty.