Unused function $$AsyncCallbackProvider

[alexlamsl]

After #12254 and #12251, src/ng/asyncCallback.js seems to contain only dead code

[mgol]

D'oh, how did I miss that. Do you want to submit a PR?

[alexlamsl]

I don't have AngularJS codebase set up to do PRs properly, sorry.

Only spotted this whilst auditing the changes on angular.js between 1.4.2 & 1.4.3

[lgalfaso]

@alexlamsl thanks for reporting this. A fix landed with 8ed6829

[alexlamsl]

I am not familiar enough with the build to be sure, but does this line need to be removed as well?

[lgalfaso]

@alexlamsl you are right. Thanks!