[XProto] Remove xcbproto from sysroots

It's no longer necessary after xcbproto is added to third_party in:
https://chromium-review.googlesource.com/c/chromium/src/+/2269546

R=thestig

Change-Id: Ie475b124684de6f504149386274b567386bc6bbe
Bug: 1066670
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276730
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784556}
GitOrigin-RevId: bbee18c9ae097d2eee3fce8ea661b7d8b734bfb1

linux/sysroot_scripts/sysroot-creator-sid.sh

@@ -361,7 +361,6 @@ DEBIAN_PACKAGES="\
   libzstd1
   linux-libc-dev
   mesa-common-dev
-  python-xcbgen
   shared-mime-info
   speech-dispatcher
   uuid-dev
@@ -378,7 +377,6 @@ DEBIAN_PACKAGES="\
   x11proto-scrnsaver-dev
   x11proto-xext-dev
   x11proto-xinerama-dev
-  xcb-proto
   zlib1g
   zlib1g-dev
 "

linux/sysroot_scripts/sysroot-creator.sh

@@ -466,9 +466,8 @@ InstallIntoSysroot() {
     dpkg-deb -e ${package} ${INSTALL_ROOT}/debian/${base_package}/DEBIAN
   done
 
-  # Prune /usr/share, leaving only pkgconfig and xcb.
-  ls -d ${INSTALL_ROOT}/usr/share/* | \
-      grep -v "/\(pkgconfig\|xcb\)$" | xargs rm -r
+  # Prune /usr/share, leaving only pkgconfig.
+  ls -d ${INSTALL_ROOT}/usr/share/* | grep -v "/pkgconfig$" | xargs rm -r
 }