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[sqlite] Indirect recover.c dependencies on Pager.

Replace dependencies on SQLite's Pager and DbPage structures with local
wrappers, in preparation for rewriting those wrappers in terms of
sqlite3_file.  The primary substantive change is that RecoverPager is an
owned reference, while Pager was a reference shared with SQLite at
large.  DbPage already needed ref-counting so RecoverPage matches that.

BUG=584407

Review URL: https://codereview.chromium.org/1671043003

Cr-Commit-Position: refs/heads/master@{#374768}