Remove const for SyncValueStoreCache::GetSyncableService()

Constness for a member function returning a non-const pointer has no
good semantics, since the returned pointer can be used to mutate the
object. There's also no need, so let's just remove const.

Bug: None
Change-Id: I39f394ffe96370b92a52ac40451758ac0fef40c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518578
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640213}
2 files changed