mac: Remove some 10.6-SDK-only sandbox code.

sandbox/mac/BUILD.gn

Index: sandbox/mac/BUILD.gn
diff --git a/sandbox/mac/BUILD.gn b/sandbox/mac/BUILD.gn
index cdaf527a561f7259691241fc910e05bfac8680b1..c317cefddbf05449a2986999eb8f5ffc99790e10 100644
--- a/sandbox/mac/BUILD.gn
+++ b/sandbox/mac/BUILD.gn
@@ -5,45 +5,6 @@
 import("//build/config/mac/mac_sdk.gni")
 import("//testing/test.gni")
 
-generate_stubs_script = "//tools/generate_stubs/generate_stubs.py"
-generate_stubs_header = "xpc_stubs_header.fragment"
-generate_stubs_sig_public = "xpc_stubs.sig"
-generate_stubs_sig_private = "xpc_private_stubs.sig"
-generate_stubs_project = "sandbox/mac"
-generate_stubs_output_stem = "xpc_stubs"
-
-action("generate_stubs") {
-  script = generate_stubs_script
-  sources = [
-    generate_stubs_sig_private,
-    generate_stubs_sig_public,
-  ]
-  inputs = [
-    generate_stubs_header,
-  ]
-  outputs = [
-    "$target_gen_dir/$generate_stubs_output_stem.cc",
-    "$target_gen_dir/$generate_stubs_output_stem.h",
-  ]
-  args = [
-    "-i",
-    rebase_path(target_gen_dir, root_build_dir),
-    "-o",
-    rebase_path(target_gen_dir, root_build_dir),
-    "-t",
-    "posix_stubs",
-    "-e",
-    rebase_path(generate_stubs_header, root_build_dir),
-    "-s",
-    generate_stubs_output_stem,
-    "-p",
-    generate_stubs_project,
-    "-x",
-    "SANDBOX_EXPORT",
-  ]
-  args += rebase_path(sources, root_build_dir)
-}
-
 component("sandbox") {
   sources = [
     "bootstrap_sandbox.cc",
@@ -59,7 +20,6 @@ component("sandbox") {
     "policy.h",
     "pre_exec_delegate.cc",
     "pre_exec_delegate.h",
-    "xpc.cc",
     "xpc.h",
     "xpc_message_server.cc",
     "xpc_message_server.h",
@@ -71,15 +31,6 @@ component("sandbox") {
   deps = [
     "//base",
   ]
-
-  # When the build SDK is 10.6, generate a dynamic stub loader. When the
-  # SDK is higher, then libxpc.dylib will be loaded automatically as part
-  # of libSystem, and only forward declarations of private symbols are
-  # necessary.
-  if (mac_sdk_version == "10.6") {
-    deps += [ ":generate_stubs" ]
-    sources += get_target_outputs(":generate_stubs")
-  }
 }
 
 test("sandbox_mac_unittests") {