Suppress a mac leak in DatabaseManager.

BUG=340718
TBR=tkent@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/154083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248757 0039d316-1c4b-4281-b951-d872f2087c98
[AudioPlayer] Enable new audio-player by default

This patch is reland of r248688, fixing the test failures.

BUG=273308
TEST=manually tested
R=hirono@chromium.org

Review URL: https://codereview.chromium.org/136783007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248758 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248757
SVN changes up to revision 248758