This reverts commit 00fc15ac0073b86270e7c0f40d386f95dfe31e86.
With Caffeine, accessing the cache from the cache loader is causing an
infinite loop [1]. Merging that change up to stable-2.15 exposed that
there is still at least one cache loader (PatchListLoader) accessing its
cache (PatchListCacheImpl).
The test going into an infinite loop on stable-2.15 is
RevisionDiffIT.rebaseHunksOneLineApartFromRegularHunkAreIdentified.
Revert the change until circular dependency is removed or a solution is
found to access the cache from the cache loader.
[1]https://github.com/ben-manes/caffeine/issues/89
Bug: Issue 8464
Change-Id: If65560b4a9bfcf0a03decaedd83ad000c6b28f4f
b4cb044be9