GitLab

(1) Fix issue which set real PhoneHubManager when the page loads, even
    if it was already set. This prevents unnecessary re-initialization.
(2) Fix issue which displayed the Phone Hub UI even when the flag was
    disabled; now, we show a button leading users to the flag.
(3) Clean up some function names and alphabetize files.

Bug: 1106937
Change-Id: Ie11e136f6087d14176081fb6a45a2c587bc6da18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402107Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805522}