[Mac] Enumerate webcam devices on the main thread.
The associated bug is about a crash in code which is only loaded due
to +deviceNames, though the crash does not have any such code on the
stack. If that call were not thread-safe, then possibly using it on a
different thread breaks assumptions about where things are allocated
and released.
BUG=139164
Review URL: https://chromiumcodereview.appspot.com/11017045
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@161024 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed
