[video] : added mime-type for mov files

- Added video/quicktime mime type for mov files in
  MediaFiles.Depend on the mime-type it decides
  to show either in gallery or music app

CRs-fixed: 515036

Change-Id: Ieab6c15d78d2d140158833905e8e387643f1157a
Don't make isSafeMode a field on the Zygote class.

This field is written and read exclusively by the system server,
and should therefore belong to the SystemServer class.

Change-Id: I2708a9a45c0c9cd1a6f563e8cc5844bd8c424bf7