chroot hook: Unmerge old libchrome when switching to new slot
libchrome is being uprevved one commit to include the version.cc files.
This does not actually bump it's Chromium revision.
BUG=chromium:588220
TEST=emerge-${BOARD} chromeos-base/libchrome
CQ-DEPEND=CL:361410
Change-Id: I6559a50a4aa5430085b057a04a3341867fb8260b
Reviewed-on: https://chromium-review.googlesource.com/361584
Commit-Ready: Greg Kerr <kerrnel@chromium.org>
Tested-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@google.com>
diff --git a/chroot_version_hooks.d/142_unmerge_libchrome b/chroot_version_hooks.d/142_unmerge_libchrome
new file mode 120000
index 0000000..b93eefc
--- /dev/null
+++ b/chroot_version_hooks.d/142_unmerge_libchrome
@@ -0,0 +1 @@
+139_unmerge_libchrome
\ No newline at end of file
