Revert 240883 "Refactor audio manager for Android to avoid heavy..."

> Refactor audio manager for Android to avoid heavy tasks at startup.
> 
> Main goal of this CL is to avoid all demanding tasks (e.g. initiate audio routing, detect BT devices etc.) at Chrome startup.
> 
> All we do now is to populate the list of available devices. BT support has been removed but will be added in an upcoming CL. Detection will not require BLUETOOTH permission.
> 
> BUG=324464
> TEST=media_unittests --gtest-filter=AudioAndroid*
> R=bulach@chromium.org, tommi@chromium.org
> 
> Review URL: https://codereview.chromium.org/110173003

TBR=henrika@chromium.org

Review URL: https://codereview.chromium.org/105893005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240885 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240885
Revert of https://codereview.chromium.org/100103009/
Reason for revert: Doesn't build :-< sorry!

TBR=phoglund@chromium.org,mcasas@chromium.org,tommi@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/107853006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240886 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240886