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The functions there are only used within search.cc. They're also weird
and shouldn't be used by anyone, so as a first step, let's make them as
invisible as possible.

Bug: 604771
Change-Id: I23e373437b0e7882fbcc1de5a83321f2f26903d2
Reviewed-on: https://chromium-review.googlesource.com/800551Reviewed-by: Chris Pickel <sfiera@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520915}