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This CL takes care of a quick clean-up TODO for the linked bug, and no
behavior is changed. registerForEvents() and requestUpdatedAboutInfo()
are two private APIs used by the chrome://sync-internals debugging page
and always called together, so they are now merged into a single API.

Fixed: 1138535
Change-Id: I712959f49bcb89820f369ba5d41c4e50e2203735
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514421
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823292}