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When custom frame is used for a widget, the "client area" shouldn't
be sent based on the client-area, otherwise the located event on the
frame will be handled incorrectly.

With this CL, DesktopWindowTreeHostMus checks remove_standard_frame
of Widget::InitParams and adopts that behavior, thus dialogs of
using custom frame and bubbles will not send client area anymore.

This property is already used in BrowserFrameMash, so
set_auto_update_client_area method is now gone.

Bug: 935338
Test: manually
Change-Id: I285954a53fea3f9f32d2fc24847cd869e5d5f939
Reviewed-on: https://chromium-review.googlesource.com/c/1488179
Auto-Submit: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636248}