tree ec7e7819a2dfe0a044d0ecd2f6b0009be6126e9d
parent 7210b3109d3c93dd95eec0f74ab0635cba55fe2b
author Patrick Venture <venture@google.com> 1538444254 -0700
committer Patrick Venture <venture@google.com> 1538661441 +0000

manager: return abstract base type

Unit-tests later required knowing the vtable for a BlobManager, and this
should avoid that needless complication.

Change-Id: I7a208d08c2065b7383fd5095e00d17c1ab3b0cf5
Signed-off-by: Patrick Venture <venture@google.com>