Remove abstract from class members in dart libraries

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.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
 
   /* patch */ factory Int8List.view(ByteArray array,
@@ skipping 97 matching lines @@
     return new _Float64Array(length);
   }
 
   /* patch */ factory Float64List.view(ByteArray array, [int start = 0, int length]) {
     return new _Float64ArrayView(array, start, length);
   }
 }
 
 
 abstract class _ByteArrayBase {
-  abstract int lengthInBytes();
+  int lengthInBytes();
 
-  abstract int bytesPerElement();
+  int bytesPerElement();
 
-  abstract operator[](int index);
+  operator[](int index);
 
   // Methods implementing the Collection interface.
 
   bool contains(element) => Collections.contains(this, element);
 
   void forEach(void f(element)) {
     var len = this.length;
     for (var i = 0; i < len; i++) {
       f(this[i]);
     }
@@ skipping 1465 matching lines @@
     return _array._setFloat64(_offset + byteOffset, value);
   }
 
   final _ByteArrayBase _array;
   final int _offset;
   final int _length;
 }
 
 
 class _ByteArrayViewBase {
-  abstract num operator[](int index);
+  num operator[](int index);
 
   // Methods implementing the Collection interface.
 
   void forEach(void f(element)) {
     var len = this.length;
     for (var i = 0; i < len; i++) {
       f(this[i]);
     }
   }
 
@@ skipping 15 matching lines @@
   }
 
   bool some(bool f(element)) {
     return Collections.some(this, f);;
   }
 
   bool get isEmpty {
     return this.length == 0;
   }
 
-  abstract int get length;
+  int get length;
 
   // Methods implementing the List interface.
 
   set length(newLength) {
     throw new UnsupportedError(
         "Cannot resize a non-extendable array");
   }
 
   void add(value) {
     throw new UnsupportedError(
@@ skipping 764 matching lines @@
     }
     _rangeCheck(this.length, start, length);
     return _array.subByteArray(_offset + start, length);
   }
 
   static const int _BYTES_PER_ELEMENT = 8;
   final ByteArray _array;
   final int _offset;
   final int _length;
 }