mount-passthrough: drop false libbrillo dependency

This is causing build failures (retries) because we don't declare a
DEPENDency in the ebuild.

BUG=none
TEST=build

Change-Id: I68708134ff44111d97bdfcd52a5f33f635839087
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1553759
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Risan <risan@chromium.org>
diff --git a/arc/mount-passthrough/BUILD.gn b/arc/mount-passthrough/BUILD.gn
index f8eea29..7089483 100644
--- a/arc/mount-passthrough/BUILD.gn
+++ b/arc/mount-passthrough/BUILD.gn
@@ -13,7 +13,6 @@
 pkg_config("mount-passthrough_config") {
   pkg_deps = [
     "fuse",
-    "libbrillo-${libbase_ver}",
     "libcap",
     "libchrome-${libbase_ver}",
   ]
diff --git a/arc/mount-passthrough/mount-passthrough.cc b/arc/mount-passthrough/mount-passthrough.cc
index 4e91c7a..5186120 100644
--- a/arc/mount-passthrough/mount-passthrough.cc
+++ b/arc/mount-passthrough/mount-passthrough.cc
@@ -9,7 +9,6 @@
 #include <base/logging.h>
 #include <base/strings/string_split.h>
 #include <base/strings/stringprintf.h>
-#include <brillo/flag_helper.h>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>