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Just making const some things that can be made const. Primarily
stemming from template_url_service.

Change-Id: If7e368a15fcf3ada82c074f808de5fa8b7c4a878
Reviewed-on: https://chromium-review.googlesource.com/959055
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543699}