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The basic settings page (via MainPageBehavior) searches its children
for settings-sections to hide when it expands a subpage. Because CL
https://chromium-review.googlesource.com/c/chromium/src/+/1105185
pushed the multidevice settings-section down the DOM tree, it is no
longer automatically hidden. To avoid dealing with the /deep/ selector
(see https://bugs.chromium.org/p/chromium/issues/detail?id=852098)
I just had the basic page take page expansion into account directly
when deciding whether to attach the
multidevice-settings-section-container.

Bug: 854400
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I89e08e5af79163146737d7ae5a9637536cb032c2
Reviewed-on: https://chromium-review.googlesource.com/1107168
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568711}