Removed unnecessary async/await keywords

I am Semih Okur, a PhD student in the CS department at the University of Illinois. I'm currently doing research on asynchronous programming in phone applications. I developed a tool that automatically improves async/await usages by doing transformations.

The tool found some opportunities in your application. There was no need to use async/await for 3 methods. It will decrease the overhead that is caused by async/await state machine and it will simplify the code. Removing async/await does not change the behavior at all. 

Are you interested in merging this pull request? If not, please let me know why.

Thanks for your time,
Semih Okur