Disallow underscores in named formal parameters.

Disallow underscores in named formal parameters.

See issue http://code.google.com/p/dart/issues/detail?id=2493

Committed: https://code.google.com/p/dart/source/detail?r=8631

[zundel, 2012-06-11 15:53:30]

Submitting unit tests and core library changes under a different patch: 
http://codereview.chromium.org/10545114/

[gram, 2012-06-11 15:58:07]

lgtm

I'm not familiar with the compiler source although the changes there looked
reasonable to me, and the matcher changes are fine.

[zundel, 2012-06-12 12:01:47]

Committed the library changes separately in r8536.

This patch is blocked on addressing a few violations of 6.2.2 in the dartium
html library.  See http://code.google.com/p/dart/issues/detail?id=3496

On 2012/06/11 15:58:07, gram wrote:
> lgtm
> 
> I'm not familiar with the compiler source although the changes there looked
> reasonable to me, and the matcher changes are fine.

[zundel, 2012-06-12 13:26:27]

@Gilad,  could you review the _test.dart files? Thanks

[gbracha, 2012-06-12 14:14:43]

On 2012/06/12 13:26:27, zundel wrote:
> @Gilad,  could you review the _test.dart files? Thanks

lgtm

[scheglov, 2012-06-13 21:01:23]

LGTM