Update angular.toJson extern to support booleans. (#2025)
Update angular.toJson extern to support booleans. (#2025)

This was recently updated in the [angular documentation](https://github.com/angular/angular.js/commit/f1cc58c7d282d48a9b23b90f1cc5e5b2bc9f296e).
Dominator008/closure-compiler,ChadKillingsworth/closure-compiler,anomaly/closure-compiler,Pimm/closure-compiler,GerHobbelt/closure-compiler,mprobst/closure-compiler,vobruba-martin/closure-compiler,MatrixFrog/closure-compiler,Yannic/closure-compiler,anomaly/closure-compiler,brad4d/closure-compiler,tiobe/closure-compiler,tdelmas/closure-compiler,tdelmas/closure-compiler,shantanusharma/closure-compiler,nawawi/closure-compiler,mprobst/closure-compiler,Yannic/closure-compiler,brad4d/closure-compiler,google/closure-compiler,vobruba-martin/closure-compiler,brad4d/closure-compiler,MatrixFrog/closure-compiler,shantanusharma/closure-compiler,vobruba-martin/closure-compiler,google/closure-compiler,shantanusharma/closure-compiler,shantanusharma/closure-compiler,GerHobbelt/closure-compiler,anomaly/closure-compiler,monetate/closure-compiler,tiobe/closure-compiler,Pimm/closure-compiler,ChadKillingsworth/closure-compiler,mprobst/closure-compiler,tiobe/closure-compiler,google/closure-compiler,Yannic/closure-compiler,monetate/closure-compiler,nawawi/closure-compiler,vobruba-martin/closure-compiler,mprobst/closure-compiler,GerHobbelt/closure-compiler,nawawi/closure-compiler,monetate/closure-compiler,tdelmas/closure-compiler,MatrixFrog/closure-compiler,MatrixFrog/closure-compiler,google/closure-compiler,nawawi/closure-compiler,Yannic/closure-compiler,ChadKillingsworth/closure-compiler,anomaly/closure-compiler,tiobe/closure-compiler,Dominator008/closure-compiler,tdelmas/closure-compiler,GerHobbelt/closure-compiler,Dominator008/closure-compiler,ChadKillingsworth/closure-compiler,monetate/closure-compiler,Pimm/closure-compiler