Consistently use "use strict" where possible.

src/array-iterator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
 
 var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object");
 var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next");
 var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind");
@@ skipping 134 matching lines @@
 macro EXTEND_TYPED_ARRAY(NAME)
   %AddNamedProperty($NAME.prototype, 'entries', ArrayEntries, DONT_ENUM);
   %AddNamedProperty($NAME.prototype, 'values', ArrayValues, DONT_ENUM);
   %AddNamedProperty($NAME.prototype, 'keys', ArrayKeys, DONT_ENUM);
   %AddNamedProperty($NAME.prototype, symbolIterator, ArrayValues, DONT_ENUM);
 endmacro
 
   TYPED_ARRAYS(EXTEND_TYPED_ARRAY)
 }
 ExtendTypedArrayPrototypes();