bpf_dsl: Move {Bool,Result}ExprImpl definition into separate header

sandbox/linux/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 
 declare_args() {
   compile_suid_client = is_linux
 
   compile_credentials = is_linux
@@ skipping 122 matching lines @@
 #            "../testing/android/native_test.gyp:native_test_native_code",
 #          ],
 #        }],
 #      ],
 #    },
 
 component("seccomp_bpf") {
   sources = [
     "bpf_dsl/bpf_dsl.cc",
     "bpf_dsl/bpf_dsl.h",
+    "bpf_dsl/bpf_dsl_impl.h",
     "bpf_dsl/cons.h",
     "seccomp-bpf/basicblock.cc",
     "seccomp-bpf/basicblock.h",
     "seccomp-bpf/codegen.cc",
     "seccomp-bpf/codegen.h",
     "seccomp-bpf/die.cc",
     "seccomp-bpf/die.h",
     "seccomp-bpf/errorcode.cc",
     "seccomp-bpf/errorcode.h",
     "seccomp-bpf/instruction.h",
@@ skipping 158 matching lines @@
   #      'type': 'none',
   #      'variables': {
   #        'test_suite_name': 'sandbox_linux_jni_unittests',
   #      },
   #      'dependencies': [
   #        'sandbox_linux_jni_unittests',
   #      ],
   #      'includes': [ '../../build/apk_test.gypi' ],
   #      }
 }