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Previously, if a mic is not plugged in or some other error occurs (e.g.,
NaCl is disabled), the checkbox is disabled. Now, the checkbox is always
available to turn on or off (with the yellow triangle showing you
whether there is an error).

BUG=396993

Review URL: https://codereview.chromium.org/463823002

Cr-Commit-Position: refs/heads/master@{#290201}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290201 0039d316-1c4b-4281-b951-d872f2087c98