Revert "This change makes it easier to put type parameters on JavaScript Arrays."

sdk/lib/_internal/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:_collection-dev" as _symbol_dev;
 import 'dart:_interceptors';
 import 'dart:_js_helper' show checkNull,
                               getRuntimeType,
                               JSSyntaxRegExp,
                               Primitives,
                               stringJoinUnchecked,
                               objectHashCode;
+import 'dart:_js_primitives' show
+    newFixedList,
+    newGrowableList;
 
 String _symbolToString(Symbol symbol) => _symbol_dev.Symbol.getName(symbol);
 
 _symbolMapToStringMap(Map<Symbol, dynamic> map) {
   if (map == null) return null;
   var result = new Map<String, dynamic>();
   map.forEach((Symbol key, value) {
     result[_symbolToString(key)] = value;
   });
   return result;
@@ skipping 159 matching lines @@
 // Patch for Stopwatch implementation.
 patch class Stopwatch {
   patch static int _frequency() => 1000000;
   patch static int _now() => Primitives.numMicroseconds();
 }
 
 
 // Patch for List implementation.
 patch class List<E> {
   patch factory List([int length]) {
-    if (length == null) return new JSArray<E>.emptyGrowable();
-    return new JSArray<E>.fixed(length);
+    if (length == null) return newGrowableList(0);
+    // Explicit type test is necessary to protect [newFixedList] in
+    // unchecked mode.
+    if ((length is !int) || (length < 0)) {
+      throw new ArgumentError("Length must be a positive integer: $length.");
+    }
+    return newFixedList(length);
   }
 
   patch factory List.filled(int length, E fill) {
-    List result = new JSArray<E>.fixed(length);
+    // Explicit type test is necessary to protect [newFixedList] in
+    // unchecked mode.
+    if ((length is !int) || (length < 0)) {
+      throw new ArgumentError("Length must be a positive integer: $length.");
+    }
+    List result = newFixedList(length);
     if (length != 0 && fill != null) {
       for (int i = 0; i < result.length; i++) {
         result[i] = fill;
       }
     }
     return result;
   }
 }
 
 
@@ skipping 109 matching lines @@
 
 patch class Uri {
   patch static bool get _isWindows => false;
 
   patch static Uri get base {
     String uri = Primitives.currentUri();
     if (uri != null) return Uri.parse(uri);
     throw new UnsupportedError("'Uri.base' is not supported");
   }
 }