Revert "Attempt to fix audio wedges by restarting all streams on OSX."

This reverts commit http://crrev.com/238501 in favor  a simpler approach
which delays stream creation around suspend and resume events:
http://crrev.com/247026

Care must be taken to monitor the UMA stat for increases after this lands.
I'll also communicate with the YT team on the bug/ to ensure they provide
some assistance in testing.

BUG=160920
TEST=No stream hangs.

Review URL: https://codereview.chromium.org/190553004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263076 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed