sqlite: Update process for changes in README.chromium.

This CL aligns the process for changing SQLite with the new process for
upgrading SQLite.

Change-Id: I0bfd95855606642de569844145b1d4b0117341c4
Reviewed-on: https://chromium-review.googlesource.com/c/1349458
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Chris Mumford <cmumford@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#612964}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a71e10219539345ce581c6882c33ef2ad120d332
1 file changed