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If a device has no internal battery, it made no sense to use the phrase
"While charging" as it implies that there is a battery to be charged.
This change moves the idle power dropdown to the "When idle" section.

Screenshot: https://screenshot.googleplex.com/4qDUBZaQWDFyRwj

Fixed: 1096675
Test: browser_tests
Change-Id: Ib7e8cd1331b92ac9bf420d32833f14486f07befd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616800Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841647}