This reverts commit 0d157b3561.
Reason for revert: full class name goes into H2 keys and values,
and possibly in other data structures in other deployments
(eg. at google), causing cache misses, warnings and/or more
cache dysfunction.
See also https://bugs.chromium.org/p/gerrit/issues/detail?id=7784&desc=2
Change-Id: I03851b8f783b93929e7dc27548fb75882b6bfe05