angular/angular.dart — pull request #1486 by BlackHC (2014-09-22 16:42:06+00:00)
Title: Remove NG_VALID/ng-valid

The NG_VALID is never used. Likewise, the ng-valid css class is never set by NgControl/NgModel.

Its existence is confusing because a reader will think that ng-valid can be used to style fields that are valid.

Alternatively, NG_VALID could be added as opposite style to _getOppositeInfoState to be in sync with user expectations.