This patch cleans RunWithLocks up a little bit by reducing the number
of delay function terminations, and using the QAThread class to ensure
exceptions are thrown at the right time and in the right place.

Signed-off-by: Hrvoje Ribicic <riba@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>
Signed-off-by: Thomas Thrainer <thomasth@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>

(cherry picked from commit 9558c2a4)