unittest fix: Get rid of the deprecation of IllegalJsRegexException's matcher.

unittest fix: Get rid of the deprecation of IllegalJsRegexException's matcher. The underlying type has
been deprecated for some time already, so I think we can safely get rid of this.
Adding the @deprecated works, but adding the dependence on meta breaks some of
our bots that don't use pub.

Committed: https://code.google.com/p/dart/source/detail?r=19083

[gram, 2013-02-26 21:33:36]

lgtm

[kevmoo-old, 2013-02-26 21:37:29]

Please commit. I lack the bit. :-)

[Siggi Cherem (dart-lang), 2013-02-26 21:39:42]

Committed patchset #1 manually as r19083 (presubmit successful).

[Siggi Cherem (dart-lang), 2013-02-26 21:40:37]

thanks!

It's a shame, I'd have preferred to keep the @deprecated, but 'unittest' is used
heavily in the bots too, which is why we have this issue. 

For the other packages (e.g. logging), we should be ok.