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If we show help text in Click to Call dialogs, we can just embed the
origin into the help text itself instead of showing it as a separate
line. We keep showing it as a standalone label in the footnote if there
is no help text.

Before: https://imgur.com/PSIfHmz
After: https://imgur.com/UXeUbmp

Bug: 1019242
Change-Id: Id59ff2e53d2f3a5e7ab9da9a1ed876fb5d45641d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887617
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Himanshu Jaju <himanshujaju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711361}