clang-format: [JS] support closures in container literals.

Before:
  return {body: {setAttribute: function(key, val) {this[key] = val;
  }
  , getAttribute : function(key) { return this[key]; }
  , style : {
  direction:
    ''
  }
  }
  }
  ;

After:
  return {
    body: {
      setAttribute: function(key, val) { this[key] = val; },
      getAttribute: function(key) { return this[key]; },
      style: {direction: ''}
    }
  };

llvm-svn: 208292