[rAc - i18n] don't call callbacks on Storage destruction

The leaks this would have caused before should now be fixed.

BUG=none

Review URL: https://codereview.chromium.org/132723003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244097 0039d316-1c4b-4281-b951-d872f2087c98
Fix chromeos=1 so Pulse is preferred when use_cras=0.

Merges the settings for use_alsa and use_pulseaudio for selection
based on use_cras.

BUG=none
TEST=Pulse is available along with ALSA when chromeos=1.

Review URL: https://codereview.chromium.org/132773002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244098 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244098