Bug 838843 - [email] email search does not update as headers are modified or deleted, allows user to still see and fail to display deleted messages. r=mcav

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/296
Merge pull request #17927 from asutherland/email-search-updates

Bug 838843 - [email] email search does not update as headers are modified or deleted, allows user to still see and fail to display deleted messages. r=mcav