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After getting volume and mute to restore (Issue 6118006), there was one case where it did not: if volume
was adjusted for the first time after a fresh install, it would not be remembered on next boot until
mute was pressed at least once.

BUG=chrome-os:10470
TEST=Manual, volume should be the same after adjusting after fresh install and rebooting

Review URL: http://codereview.chromium.org/6321014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72179 0039d316-1c4b-4281-b951-d872f2087c98