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In preparation for a single shared database for browser features,
additional parameters have been added to LoadWithFilter to allow
only specific entries to be loaded instead of the entire database.
Some minor modifications to FakeDB are made to ensure tests still
build and run.

Bug: 870813
Change-Id: I802331d477ec0ed2d6821c6d937cb2d497560345
Reviewed-on: https://chromium-review.googlesource.com/1169874
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585497}