Run dartfmt on js_ast

pkg/js_ast/lib/src/characters.dart

 // Copyright (c) 2015, 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.
 
 library js_character_codes;
 
 const int $EOF = 0;
 const int $STX = 2;
-const int $BS  = 8;
+const int $BS = 8;
 const int $TAB = 9;
 const int $LF = 10;
 const int $VTAB = 11;
 const int $FF = 12;
 const int $CR = 13;
 const int $SPACE = 32;
 const int $BANG = 33;
 const int $DQ = 34;
 const int $HASH = 35;
 const int $$ = 36;
@@ skipping 88 matching lines @@
 const int $CLOSE_CURLY_BRACKET = 125;
 const int $TILDE = 126;
 const int $DEL = 127;
 const int $NBSP = 160;
 const int $LS = 0x2028;
 const int $PS = 0x2029;
 
 const int $FIRST_SURROGATE = 0xd800;
 const int $LAST_SURROGATE = 0xdfff;
 const int $LAST_CODE_POINT = 0x10ffff;