[Merge to M96] [linux/xfce] Introduced a hack for Xfwm.

This proposes an alternative to [1].  Either this patch or that one
should be landed, but not both.  See the linked crbug for the details.

Setting the frame extents via the _GTK_FRAME_EXTENTS property turned out
to be problematic at Xfwm.  While the issue is agreed to be a bug in the
window manager, for now we disable setting the frame extents on that WM.

This patch introduces a logic that disables setting the window property
on Xfwm.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/3275653

(cherry picked from commit 245e71ae8de3f4b5f3478739be819981bb12dfab)

Bug: 1260821
Change-Id: I4b734ac0dc2b97d7ed6b1842564a33ec6e4b4035
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3275272
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Original-Commit-Position: refs/heads/main@{#941444}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3300276
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/branch-heads/4664@{#1183}
Cr-Branched-From: 24dc4ee75e01a29d390d43c9c264372a169273a7-refs/heads/main@{#929512}

• ui/platform_window/x11/x11_window.cc[diff]