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This method is only implemented on the base class, which always returns
false. Delete the method, its implementation, a wrapper around it in
DesktopWindowTreeHostWin, and the only call to it in HWNDMessageHandler.

Open question: is WidgetDelegate::HandleWorkAreaChanged() now dead? It
can only be called in HWNDMessageHandler::OnSettingChange() when
GetParent(hwnd()), but under what circumstances is that true?

Bug: None
Change-Id: Ib00d0b67597ded401c624786b54051bdf2373769
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364212Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799829}