Address more TOOD(GYP) in GN build.

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")
 import("//build/config/nacl/config.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 417 matching lines @@
         "suid/client/setuid_sandbox_host.cc",
         "suid/client/setuid_sandbox_host.h",
         "suid/common/sandbox.h",
         "suid/common/suid_unsafe_environment_variables.h",
       ]
     }
   }
 }
 
 if (is_android) {
-  # TODO(GYP) Delete this after we've converted everything to GN.
+  # TODO(GYP_GONE) Delete this after we've converted everything to GN.
   group("sandbox_linux_unittests_deps") {
     testonly = true
     deps = [
       ":sandbox_linux_unittests",
     ]
   }
 }