This reverts commit ef0f7fb9.

Reason for revert: Altered behavior of Queries prior to Tx commit. See #20631.

Change-Id: I2548507c2935a7c60b92aae377dcc8e9aca66331
Reviewed-on: https://go-review.googlesource.com/45231
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Bulat Gaifullin <gaifullinbf@gmail.com>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>