Redo "Steps towards making dart2js JS AST templates an indepentent library."

pkg/compiler/lib/src/js/builder.dart

 // Copyright (c) 2013, 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.
 
 // Utilities for building JS ASTs at runtime.  Contains a builder class
 // and a parser that parses part of the language.
 
-part of js;
+part of js_ast;
 
 
 /**
  * Global template manager.  We should aim to have a fixed number of
  * templates. This implies that we do not use js('xxx') to parse text that is
  * constructed from values that depend on names in the Dart program.
  *
  * TODO(sra): Find the remaining places where js('xxx') used to parse an
  * unbounded number of expression, or institute a cache policy.
  */
@@ skipping 1308 matching lines @@
   Catch parseCatch() {
     expectCategory(LPAREN);
     String identifier = lastToken;
     expectCategory(ALPHA);
     expectCategory(RPAREN);
     expectCategory(LBRACE);
     Block body = parseBlock();
     return new Catch(new VariableDeclaration(identifier), body);
   }
 }