Update from https://crrev.com/306655

sandbox/linux/BUILD.gn

Index: sandbox/linux/BUILD.gn
diff --git a/sandbox/linux/BUILD.gn b/sandbox/linux/BUILD.gn
index 0f8f86a43c5c45b487dd8283fe135034a8334a09..ff4a238fe1e8bec37d38e7ebdb58bc3ac5356069 100644
--- a/sandbox/linux/BUILD.gn
+++ b/sandbox/linux/BUILD.gn
@@ -71,6 +71,7 @@ test("sandbox_linux_unittests") {
     "services/syscall_wrappers_unittest.cc",
     "services/thread_helpers_unittests.cc",
     "services/yama_unittests.cc",
+    "syscall_broker/broker_file_permission_unittest.cc",
     "syscall_broker/broker_process_unittest.cc",
     "tests/main.cc",
     "tests/scoped_temporary_file.cc",
@@ -108,6 +109,7 @@ test("sandbox_linux_unittests") {
       "seccomp-bpf/bpf_tests_unittest.cc",
       "seccomp-bpf/codegen_unittest.cc",
       "seccomp-bpf/errorcode_unittest.cc",
+      "seccomp-bpf/sandbox_bpf_unittest.cc",
       "seccomp-bpf/syscall_iterator_unittest.cc",
       "seccomp-bpf/syscall_unittest.cc",
     ]
@@ -115,6 +117,7 @@ test("sandbox_linux_unittests") {
   if (compile_credentials) {
     sources += [
       "services/credentials_unittest.cc",
+      "services/proc_util_unittest.cc",
       "services/unix_domain_socket_unittest.cc",
     ]
   }
@@ -173,6 +176,7 @@ component("seccomp_bpf") {
   defines = [ "SANDBOX_IMPLEMENTATION" ]
 
   deps = [
+    ":sandbox_services",
     ":sandbox_services_headers",
     "//base",
   ]
@@ -235,6 +239,8 @@ component("sandbox_services") {
     "syscall_broker/broker_client.cc",
     "syscall_broker/broker_client.h",
     "syscall_broker/broker_common.h",
+    "syscall_broker/broker_file_permission.cc",
+    "syscall_broker/broker_file_permission.h",
     "syscall_broker/broker_host.cc",
     "syscall_broker/broker_host.h",
     "syscall_broker/broker_policy.cc",
@@ -249,6 +255,8 @@ component("sandbox_services") {
     sources += [
       "services/credentials.cc",
       "services/credentials.h",
+      "services/proc_util.cc",
+      "services/proc_util.h",
     ]
     # For capabilities.cc.
     configs += [ "//build/config/linux:libcap" ]