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Ensure that a native widget gets a destroying call to ensure a right
destruction order and SiteProcessCountTracker can eventually
decrement process count.

Otherwise, a DCHECK in dtor of SiteProcessCountTracker is called.

TEST: ./out/OzoneLinux/views_unittests --ozone-platform=wayland
--gtest_filter=DesktopWindowTreeHostPlatformTest.CallOnNativeWidgetDestroying

Change-Id: I82f39a8e9673b9737215cf85e7810dbb0af78ceb
Reviewed-on: https://chromium-review.googlesource.com/1154530
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579782}