AOSP/Email - bug fix: do not allow composing message with hidden private data attachments - Switch intent filtering to be blacklist based rather than whitelist based. am: a7637e9ad2 am: 44fc5abed4 am: 6f1a746491
am: b7b7462fe4

Change-Id: I2ca7eb65d97e16dfeac97cc2db283be86092ad83