sandbox: move SyscallSet into bpf_dsl

sandbox/linux/BUILD.gn

Index: sandbox/linux/BUILD.gn
diff --git a/sandbox/linux/BUILD.gn b/sandbox/linux/BUILD.gn
index dd16cb2cdbb35b07335e6310fd515360716a9c65..64940f1455a63a84a2ce9056be8fd423468cad13 100644
--- a/sandbox/linux/BUILD.gn
+++ b/sandbox/linux/BUILD.gn
@@ -105,12 +105,12 @@ test("sandbox_linux_unittests") {
       "bpf_dsl/bpf_dsl_unittest.cc",
       "bpf_dsl/codegen_unittest.cc",
       "bpf_dsl/cons_unittest.cc",
+      "bpf_dsl/syscall_set_unittest.cc",
       "seccomp-bpf-helpers/baseline_policy_unittest.cc",
       "seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc",
       "seccomp-bpf/bpf_tests_unittest.cc",
       "seccomp-bpf/errorcode_unittest.cc",
       "seccomp-bpf/sandbox_bpf_unittest.cc",
-      "seccomp-bpf/syscall_iterator_unittest.cc",
       "seccomp-bpf/syscall_unittest.cc",
     ]
   }
@@ -158,6 +158,8 @@ component("seccomp_bpf") {
     "bpf_dsl/policy.h",
     "bpf_dsl/policy_compiler.cc",
     "bpf_dsl/policy_compiler.h",
+    "bpf_dsl/syscall_set.cc",
+    "bpf_dsl/syscall_set.h",
     "bpf_dsl/trap_registry.h",
     "seccomp-bpf/die.cc",
     "seccomp-bpf/die.h",
@@ -168,8 +170,6 @@ component("seccomp_bpf") {
     "seccomp-bpf/sandbox_bpf.h",
     "seccomp-bpf/syscall.cc",
     "seccomp-bpf/syscall.h",
-    "seccomp-bpf/syscall_iterator.cc",
-    "seccomp-bpf/syscall_iterator.h",
     "seccomp-bpf/trap.cc",
     "seccomp-bpf/trap.h",
     "seccomp-bpf/verifier.cc",