Enables VolumeTest.DefaultMicrophoneVolumeIsAtMost255

Rewritten the test to only check for valid volume when we have actually received a value from the audio device. To check if we have actually received a volume value is out of the scope for this test.

BUG=webrtc:367
TESTED=trybots
R=tina.legrand@webrtc.org, xians@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/16499006

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6123 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed