fix #379, escape of $ in template strings

fix escape of $ in template strings
https://github.com/dart-lang/dev_compiler/issues/379

R=vsm@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/914b56640af60226553a7a300e926fd4b1afb64b

[Jennifer Messerly, 2015-11-02 18:17:50]

Description was changed from

==========
fix escape of $ in template strings
==========

to

==========
fix escape of $ in template strings
https://github.com/dart-lang/dev_compiler/issues/379
==========

[Jennifer Messerly, 2015-11-02 18:17:51]

jmesserly@google.com changed reviewers:
+ vsm@google.com

[Jennifer Messerly, 2015-11-02 18:26:33]

https://codereview.chromium.org/1426243002/diff/20001/lib/src/js/builder.dart
File lib/src/js/builder.dart (right):

https://codereview.chromium.org/1426243002/diff/20001/lib/src/js/builder.dart...
lib/src/js/builder.dart:312: var re = new
RegExp('[\n\r$quoteReplace\b\f\t\v\u2028\u2029]');
not sure why this wasn't a character class before. Not sure it matters in our
regexp impl, but makes me feel better :)

[vsm, 2015-11-02 18:31:54]

lgtm

[Jennifer Messerly, 2015-11-02 18:32:53]

Committed patchset #2 (id:20001) manually as
914b56640af60226553a7a300e926fd4b1afb64b (presubmit successful).