Don't remove items from mRecords while iterating over it.

This change also make removeList a member, because it's only
actually used in an error case (when the client process has
gone away).

Bug: 3118244
Bug: 3083062
Bug: 2876696
Bug: 2778958
Change-Id: I856118d8de4309cd63287d7c57cd938e1c35dab0