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BrowserNonClientFrameView::UpdateClientArea has no default behavior and
is never overriden. It is only ever called from
BrowserNonClientFrameViewAsh::OnTabsMaxXChanged, which is the only
override of TabStripObserver::OnTabsMaxXChanged. This patch deletes
those methods.

Change-Id: Ifa943298d6a925b2f4c0cb0120164324fbacd42b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545493
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646500}