Remove GN GYP generator.

tools/gn/secondary/crypto/BUILD.gn

 # Copyright (c) 2013 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/crypto.gni")
 
 crypto_minimal_sources = [
   "hmac.cc",
   "hmac.h",
   "hmac_win.cc",
   "secure_util.cc",
   "secure_util.h",
   "symmetric_key.h",
   "symmetric_key_win.cc",
   "third_party/nss/chromium-sha256.h",
   "third_party/nss/sha512.cc",
 ]
 
 component("crypto") {
-  external = true
   output_name = "crcrypto"  # Avoid colliding with OpenSSL's libcrypto.
   sources = [
     "apple_keychain.h",
     "apple_keychain_ios.mm",
     "apple_keychain_mac.mm",
     "capi_util.cc",
     "capi_util.h",
     "crypto_export.h",
     "crypto_module_blocking_password_delegate.h",
     "cssm_init.cc",
@@ skipping 148 matching lines @@
 
   # TODO(brettw) once GYP compat is no longer necessary, just move
   # crypto_minimal_sources to the crypto_minimal target and include a
   # dependency on it here.
   sources += crypto_minimal_sources
 }
 
 # A minimal crypto subset for core features that small standalone targets can
 # use to reduce code size.
 static_library("crypto_minimal") {
-  external = true
   sources = crypto_minimal_sources
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
   ]
 
   defines = [ "CRYPTO_IMPLEMENTATION" ]
 }
 
 test("crypto_unittests") {
-  external = true
   sources = [
     # Tests.
     "curve25519_unittest.cc",
     "ec_private_key_unittest.cc",
     "ec_signature_creator_unittest.cc",
     "encryptor_unittest.cc",
     "ghash_unittest.cc",
     "hkdf_unittest.cc",
     "hmac_unittest.cc",
     "nss_util_unittest.cc",
@@ skipping 24 matching lines @@
     "//base/test:run_all_unittests",
     "//base/test:test_support_base",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_mac) {
     #deps += "//third_party/nss:nspr"
   }
 }