Remove waitFor() calls from tests

[kito99]

The current use of waitFor() causes an infinite loop if there is any problem that occurs when registering test components. This makes it impossible to test problems with decorators during registration. Consequently, we should consider changing the behavior to use the Jasmine 2.0 async features (which is what is typically used in Polymer Web Component Tester tests anyway): https://jasmine.github.io/2.0/introduction.html#section-Asynchronous_Support.