Verify calling user on mms downloads

Bug: 305710989
Test: manually tested sending/downloading MMS with the primary user. I created a secondary user and also verified that sending/downloading MMS's work on the secondary user's account
Flag: EXEMPT bugfix

(cherry picked from commit 0b8c94aa0a37c83d03f6c442c8d111fe8f49bbac)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:efda719b961b01ef63054670ec4ab308dae15bdf
Merged-In: I01782ba1358b64d49ccbab0a106b60deaa9262fa
Change-Id: I01782ba1358b64d49ccbab0a106b60deaa9262fa