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These methods should always return valid parameters, even if a device
doesn't exist.

Output code will automatically fall back to a fake path at a later time
if those parameters are used to open a stream.

Input code will fail because no input devices can be enumerated.

BUG=331675
TEST=no more crashes.

Review URL: https://codereview.chromium.org/127363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243704 0039d316-1c4b-4281-b951-d872f2087c98