GitLab

UI state of the elements related to channel switcher should depend only on update status, current and target channels, not on the internal state which is reset each time chrome://help is reloaded.

BUG=323530
TEST=manual tests on a falco device

Review URL: https://codereview.chromium.org/565903002

Cr-Commit-Position: refs/heads/master@{#295056}