Move Arrays class to private library.

sdk/lib/_internal/compiler/implementation/lib/js_helper.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.
 
 library _js_helper;
 
 import 'dart:collection';
 import 'dart:_foreign_helper' show DART_CLOSURE_TO_JS,
                                    JS,
                                    JS_CALL_IN_ISOLATE,
@@ skipping 543 matching lines @@
 
 /**
  * Called by generated code to throw an index-out-of-range exception,
  * for example, if a bounds check fails in an optimized indexed
  * access.
  */
 ioore(index) {
   throw new RangeError.value(index);
 }
 
-listInsertRange(receiver, start, length, initialValue) {
-  if (length == 0) {
-    return;
-  }
-  if (length is !int) throw new ArgumentError(length);
-  if (length < 0) throw new ArgumentError(length);
-  if (start is !int) throw new ArgumentError(start);
-
-  var receiverLength = JS('num', r'#.length', receiver);
-  if (start < 0 || start > receiverLength) {
-    throw new RangeError.value(start);
-  }
-  receiver.length = receiverLength + length;
-  Arrays.copy(receiver,
-              start,
-              receiver,
-              start + length,
-              receiverLength - start);
-  if (initialValue != null) {
-    for (int i = start; i < start + length; i++) {
-      receiver[i] = initialValue;
-    }
-  }
-  receiver.length = receiverLength + length;
-}
-
 stringLastIndexOfUnchecked(receiver, element, start)
   => JS('int', r'#.lastIndexOf(#, #)', receiver, element, start);
 
 
 checkNull(object) {
   if (object == null) throw new ArgumentError(null);
   return object;
 }
 
 checkNum(value) {
@@ skipping 1016 matching lines @@
   // of [t].
   if ((!isJsArray(s) && JS('bool', '# == null', substitution)) ||
       !isJsArray(t)) {
     return true;
   }
   // Recursively check the type arguments.
   return checkArguments(substitution, getArguments(s), getArguments(t));
 }
 
 createRuntimeType(String name) => new TypeImpl(name);