Bug 853350 - Follow up. Make windows build.
Bug 861894 - Avoid apps to schedule new offline cache downloads while device free space is low. r=honzab
Bug 861894 - Avoid apps to schedule new offline cache downloads while device free space is low. Tests. r=honzab
Bug 861920 - Avoid apps to write in its local storage while device free storage is low. r=honzab
 Bug 861920 - Avoid apps to write in its local storage while device free storage is low. Tests. r=honzab