pkg/third_party/html5lib: lots of cleanup

pkg/third_party/html5lib/lib/src/utils.dart

 /** Misc things that were useful when porting the code from Python. */
 library utils;
 
-import 'dart:collection';
 import 'constants.dart';
 
 typedef bool Predicate();
 
 class Pair<F, S> {
   final F first;
   final S second;
 
   const Pair(this.first, this.second);
 
@@ skipping 53 matching lines @@
   for (int i = 0; i < size; i++) result.write('0');
   result.write(str);
   return result.toString();
 }
 
 // TODO(jmesserly): this implementation is pretty wrong, but I need something
 // quick until dartbug.com/1694 is fixed.
 /**
  * Format a string like Python's % string format operator. Right now this only
  * supports a [data] dictionary used with %s or %08x. Those were the only things
- * needed for [errorMessages].
+ * needed for [ERROR_MESSAGES].
  */
 String formatStr(String format, Map data) {
   if (data == null) return format;
   data.forEach((key, value) {
     var result = new StringBuffer();
     var search = '%($key)';
     int last = 0, match;
     while ((match = format.indexOf(search, last)) >= 0) {
       result.write(format.substring(last, match));
       match += search.length;
@@ skipping 26 matching lines @@
 
       last = match + 1;
     }
 
     result.write(format.substring(last, format.length));
     format = result.toString();
   });
 
   return format;
 }