Remove deprecated Strings class.

sdk/lib/_internal/compiler/implementation/lib/core_patch.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.
 
 // Patch file for dart:core classes.
 
 import 'dart:_interceptors';
 import 'dart:_js_helper' show checkNull,
                               getRuntimeTypeString,
                               isJsArray,
@@ skipping 184 matching lines @@
 patch class String {
   patch factory String.fromCharCodes(List<int> charCodes) {
     if (!isJsArray(charCodes)) {
       if (charCodes is !List) throw new ArgumentError(charCodes);
       charCodes = new List.from(charCodes);
     }
     return Primitives.stringFromCharCodes(charCodes);
   }
 }
 
-// Patch for String implementation.
-patch class Strings {
-  patch static String join(Iterable<String> strings, String separator) {
-    checkNull(strings);
-    if (separator is !String) throw new ArgumentError(separator);
-    return stringJoinUnchecked(_toJsStringArray(strings), separator);
-  }
-
-  patch static String concatAll(Iterable<String> strings) {
-    return stringJoinUnchecked(_toJsStringArray(strings), "");
-  }
-
-  static List _toJsStringArray(Iterable<String> strings) {
-    checkNull(strings);
-    var array;
-    if (!isJsArray(strings)) {
-      strings = new List.from(strings);
-    }
-    final length = strings.length;
-    for (int i = 0; i < length; i++) {
-      final string = strings[i];
-      if (string is !String) throw new ArgumentError(string);
-    }
-    return strings;
-  }
-}
-
 patch class RegExp {
   patch factory RegExp(String pattern,
                        {bool multiLine: false,
                         bool caseSensitive: true})
     => new JSSyntaxRegExp(pattern,
                           multiLine: multiLine,
                           caseSensitive: caseSensitive);
 }
 
 // Patch for 'identical' function.
@@ skipping 65 matching lines @@
       String formalParameters = sb.toString();
       return "NoSuchMethodError: incorrect number of arguments passed to "
           "method named '$_memberName'\n"
           "Receiver: ${Error.safeToString(_receiver)}\n"
           "Tried calling: $_memberName($actualParameters)\n"
           "Found: $_memberName($formalParameters)";
     }
   }
 }