Revert 249576 "Cast: Wiring up the asyc initialization with the ..."

> Cast: Wiring up the asyc initialization with the video encoders.
> 
> This is a follow up cl to complete the async intialization.
> 
> Review URL: https://codereview.chromium.org/151103004

Suspected cause of browser_tests/CastStreamingApiTest.Basics failure:
http://build.chromium.org/p/chromium.mac/builders/Mac%2010.6%20Tests%20%28dbg%29%281%29/builds/46664/steps/browser_tests/logs/stdio

TBR=pwestin@google.com

Review URL: https://codereview.chromium.org/157053006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249592 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249592