Bug 869830 - [System] Receiving SMS during video recording should not pl...

https://bugzilla.mozilla.org/show_bug.cgi?id=869830

1. Title : [System] Receiving SMS during video recording should not play notification sound.
2. Precondition : Run Video app and start recording.
3. Tester's Action : Receive SMS.
4. Detailed Symptom (ENG.) : It plays the notification sound.
5. Expected : It should not play the notification sound during video recording.
6.Reproducibility: Y
           1)Frequency Rate : 100%
7.Gaia Master/v1-train : Reproduced
8.Gaia Revision: 5cbb19e4bb78a7ad879fbe4b9a841e1c35714f5c
9.Personal email id:  hanj.kim25@gmail.com