Stop log spew from SyncManager

Bug: 2734841
Change-Id: I9f14e4a4bfcd09c4e60ec4df2d7fc5cc7ef0aa51
Renaming MessageListAdapter to MessagesAdapter

in line with MailboxesAdapter.

Change-Id: I4ed387db2f5ce1f9bad282521c62eeec0c697db4
Merge commit 'd92abd08fc38b7129288ae76a5bfdd705c8302c9' into oxygen_1006

* commit 'd92abd08fc38b7129288ae76a5bfdd705c8302c9':
  Stop log spew from SyncManager
Merge commit '851f3219e2bbcfb9c02c439d84d0885d890ded8d' into oxygen_1006

* commit '851f3219e2bbcfb9c02c439d84d0885d890ded8d':
  Renaming MessageListAdapter to MessagesAdapter