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This change makes it so that all tests in database_unittest.cc now run
both with WAL mode on and off. Better test coverage will help us
transition to using WAL mode by default in the future.

Bug: 78507
Change-Id: I116a8151c1ab4919a78657e46df98b26eddb7f11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490664
Commit-Queue: Shubham Aggarwal <shuagga@microsoft.com>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821790}