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OfflinePageMetadataStore was only referenced in the unittest, now it has been
removed. A few methods/types were migrated to OfflinePageMetadataStoreSQL,
others were removed because the were no longer in use.

I removed some tests that only tested the removed methods. Other methods
that were used to test the database and were moved to the test file, like
GetOfflinePages and AddOfflinePage.

offline_page_metadata_store_unittest.cc will be renamed
offline_page_metadata_store_sql_unittest.cc in a follow-up.

Bug: 778813
Change-Id: I6315cd5fb43b8a56b84dcede8c388286dd96e39c
Reviewed-on: https://chromium-review.googlesource.com/949502Reviewed-by: Yafei Duan <romax@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541621}