sql: Remove redundant PRAGMA secure_delete=ON.

Chrome builds SQLite with SQLITE_SECURE_DELETE [1], so the default value
for the secure_delete PRAGMA [2] is already true.

[1] https://www.sqlite.org/compile.html#secure_delete
[2] https://www.sqlite.org/pragma.html#pragma_secure_delete

Bug: 910955
Change-Id: I27ef32770a980c8c6030675e79698d7a31e47a9d
Reviewed-on: https://chromium-review.googlesource.com/c/1357824
Commit-Queue: Victor Costan <[email protected]>
Reviewed-by: Chris Mumford <[email protected]>
Cr-Commit-Position: refs/heads/master@{#613866}
5 files changed