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In this part, we add the code to actually move the offline page,
update ADM, update the OfflinePageModel, and call back to the
java side code.

There is also a small refactoring to use the same symbol everywhere
for our database table name, it has moved into offline_store_utils.h.

Bug: 758690
Change-Id: Ia540cfdd9f94ac93a1211eb8b7184507b3906080
Reviewed-on: https://chromium-review.googlesource.com/985208
Commit-Queue: Peter Williamson <petewil@chromium.org>
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Jian Li <jianli@chromium.org>
Reviewed-by: Yafei Duan <romax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547801}