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When a leveldb_proto database is requested we try to open both the
unique and shared databases, when only one of those opened we used to
return that database, regardless of whether we should, this CL
incorporates the init and migration status to that logic to avoid
returning a database with stale data

Bug: 870813
Change-Id: Ide70a7d8c861f017fd55ae5faa53f5f73369f228
Reviewed-on: https://chromium-review.googlesource.com/c/1471378
Commit-Queue: Salvador Guerrero <salg@google.com>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633792}