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Previously, the names of the methods in
web_app_file_handler_registration implied it was the sole place where
file handler registrations occurred. This was confusing, as Chrome OS
directly interfaces with the registry of installed apps, so these
methods were no-ops while it seemed like they should have been doing
something.

Functionally, this also reverts https://crrev.com/c/1935296, as it
doesn't align with new aim of the interface.

Bug: 1028448
Change-Id: I8630f31ee7829165ffaef39374ea286cc85caaf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1941528Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720079}