Reapply "Use default values of named arguments when invoking the default super constructor."

Reapply "Use default values of named arguments when invoking the default super constructor."

This reapplies (a fixed version of) commit 6580 which had been reverted in commit r6582.

Old issue: https://chromiumcodereview.appspot.com//9930005

Committed: https://code.google.com/p/dart/source/detail?r=6583

[floitsch, 2012-04-16 14:56:21]

Patchset 1 contains the original CL (without modification).
Patchset 2 contains the fix.

[karlklose, 2012-04-16 14:59:31]

On 2012/04/16 14:56:21, floitsch wrote:
> Patchset 1 contains the original CL (without modification).
> Patchset 2 contains the fix.

LGTM.