Get rid of bash for dartdoc and do the whole thing in dart.

lib/dartdoc/utils.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Generic utility functions.
 
-/** Invokes [callback] and returns how long it took to execute in ms. */
-num time(callback()) {
-  final watch = new Stopwatch();
-  watch.start();
-  callback();
-  watch.stop();
-  return watch.elapsedInMs();
-}
-
 /** Turns [name] into something that's safe to use as a file name. */
 String sanitize(String name) => name.replaceAll(':', '_').replaceAll('/', '_');
 
 /** Returns the number of times [search] occurs in [text]. */
 int countOccurrences(String text, String search) {
   int start = 0;
   int count = 0;
 
   while (true) {
     start = text.indexOf(search, start);
@@ skipping 44 matching lines @@
 /**
  * Joins [items] into a single, comma-separated string using [conjunction].
  * E.g. `['A', 'B', 'C']` becomes `"A, B, and C"`.
  */
 String joinWithCommas(List<String> items, [String conjunction = 'and']) {
   if (items.length == 1) return items[0];
   if (items.length == 2) return "${items[0]} $conjunction ${items[1]}";
   return Strings.join(items.getRange(0, items.length - 1), ', ') +
     ', $conjunction ' + items[items.length - 1];
 }