More code clean-up

pkg/analyzer/lib/src/generated/java_core.dart

 library java.core;
 
 final Stopwatch nanoTimeStopwatch = new Stopwatch();
 
 const int LONG_MAX_VALUE = 0x7fffffffffffffff;
 
 class JavaSystem {
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
@@ skipping 98 matching lines @@
     if (codePoint < MIN_SUPPLEMENTARY_CODE_POINT) {
       return new String.fromCharCode(codePoint);
     }
     int offset = codePoint - MIN_SUPPLEMENTARY_CODE_POINT;
     int c0 = ((offset & 0x7FFFFFFF) >> 10) + MIN_HIGH_SURROGATE;
     int c1 = (offset & 0x3ff) + MIN_LOW_SURROGATE;
     return new String.fromCharCodes([c0, c1]);
   }
 }
 
-class CharSequence {
-  final String _content;
-  CharSequence(this._content);
-  static CharSequence wrap(String content) => new CharBuffer(content);
-  int charAt(int index) => _content.codeUnitAt(index);
-  int length() => _content.length;
-  String subSequence(int start, int end) => _content.substring(start, end);
-}
-
-class CharBuffer extends CharSequence {
-  CharBuffer(String content) : super(content);
-  static CharBuffer wrap(String content) => new CharBuffer(content);
-}
-
 class JavaString {
   static int indexOf(String target, String str, int fromIndex) {
     if (fromIndex > target.length) return -1;
     if (fromIndex < 0) fromIndex = 0;
     return target.indexOf(str, fromIndex);
   }
   static int lastIndexOf(String target, String str, int fromIndex) {
     if (fromIndex > target.length) return -1;
     if (fromIndex < 0) fromIndex = 0;
     return target.lastIndexOf(str, fromIndex);
@@ skipping 221 matching lines @@
 }
 
 bool javaCollectionContainsAll(Iterable list, Iterable c) {
   return c.fold(true, (bool prev, e) => prev && list.contains(e));
 }
 
 bool javaSetEquals(Set a, Set b) {
   return a.containsAll(b) && b.containsAll(a);
 }
 
-javaMapPut(Map target, key, value) {
-  var oldValue = target[key];
-  target[key] = value;
-  return oldValue;
-}
-
 bool javaStringEqualsIgnoreCase(String a, String b) {
   return a.toLowerCase() == b.toLowerCase();
 }
 
 bool javaStringRegionMatches(String t, int toffset, String o, int ooffset, int len) {
   if (toffset < 0) return false;
   if (ooffset < 0) return false;
   var tend = toffset + len;
   var oend = ooffset + len;
   if (tend > t.length) return false;
@@ skipping 51 matching lines @@
  *     format('{0} are you {1}ing?', ['What', 'read']) = 'What are you reading?'
  */
 String formatList(String pattern, List args) {
   return pattern.replaceAllMapped(new RegExp(r'\{(\d+)\}'), (match) {
     String indexStr = match.group(1);
     int index = int.parse(indexStr);
     var arg = args[index];
     return arg != null ? arg.toString() : null;
   });
 }