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Currently whenever we add a new in-product help feature, the developer
have to add six distinct <action> entries, which makes it easy to
overlook something. Also, these actions are typically copy-pasted from
an old entry, so they do not typically provide any good documentation
for the particular in-product help feature either.

This CL uses the new functionality introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/1015293
which fixes the fan-out for user actions, making them usable for
chromium.

For all known in-product help entries, this CL moves them to the suffix
list at the bottom of the file. This means that the action suffix list
will be defined for a few extra, since not all of them was in use for
the user actions that have already been moved to the new system.

BUG=835454

Change-Id: I72847cda991413e85c6b6e990af1f2e9e0f0cd8e
Reviewed-on: https://chromium-review.googlesource.com/1136976Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575324}