Fix breakage in the JavaScript compilers.

runtime/lib/byte_array.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.
 
 interface ByteArray {
   int lengthInBytes();
 
   ByteArray subByteArray([int start, int length]);
 
   int getInt8(int byteOffset);
@@ skipping 36 matching lines @@
 
   void setFloat64(int byteOffset, double value);
 }
 
 
 interface ByteArrayViewable {
   int bytesPerElement();
 
   int lengthInBytes();
 
-  ByteArray asByteArray([int offsetInBytes, int lengthInBytes]);
+  ByteArray asByteArray([int start, int length]);
 }
 
 
 interface Int8List extends List<int>, ByteArrayViewable
     default _Int8ArrayFactory {
   Int8List(int length);
   Int8List.view(ByteArray array, [int start, int length]);
 }
 
 
@@ skipping 209 matching lines @@
   int removeLast() {
     throw const UnsupportedOperationException(
         "Cannot remove from a non-extendable array");
   }
 
   void removeRange(int start, int length) {
     throw const UnsupportedOperationException(
         "Cannot remove from a non-extendable array");
   }
 
-  ByteArray asByteArray([int offsetInBytes = 0, int lengthInBytes]) {
-    if (lengthInBytes === null) {
-      lengthInBytes = this.lengthInBytes();
+  ByteArray asByteArray([int start = 0, int length]) {
+    if (length === null) {
+      length = this.lengthInBytes();
     }
-    return new _ByteArrayView(this, offsetInBytes, lengthInBytes);
+    return new _ByteArrayView(this, start, length);
   }
 
   int _length() native "ByteArray_getLength";
 
   void _setRange(int startInBytes, int lengthInBytes,
                  _ByteArrayBase from, int startFromInBytes)
       native "ByteArray_setRange";
 
   int _getInt8(int byteOffset) native "ByteArray_getInt8";
   void _setInt8(int byteOffset, int value) native "ByteArray_setInt8";
@@ skipping 2121 matching lines @@
     }
     _rangeCheck(start, length);
     return _array.subByteArray(_offset + start, length);
   }
 
   static final int _BYTES_PER_ELEMENT = 8;
   final ByteArray _array;
   final int _offset;
   final int _length;
 }