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HelpText is only available for Click to Call and not the other sharing features,
so move the logic to Click to Call.

Bug: 988461
Change-Id: I11bb24498205ed5c33da0e0bed0f3f58e726bc18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816559Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Commit-Queue: Yasmin Molazadeh <yasmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698473}