Fixing transformer tests to be passing

Getting a bunch of errors running run-tests.sh, these appear to be from: https://github.com/angular/angular.dart/commit/88593eec6499f93765980087fcdf59a242ec9334

Updates are primarily around modifying the test placeholder libs to match new names.
Also a number of the tests were refactored as part of the earlier referenced CL and the codepaths which was intended to be tested were no longer being exercised.