Removing NSS files and USE_OPENSSL flag

components/gcm_driver/crypto/BUILD.gn

 # Copyright 2015 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")
 
 # GYP version: components/gcm_driver.gypi:gcm_driver_crypto
 source_set("crypto") {
   sources = [
     "encryption_header_parsers.cc",
     "encryption_header_parsers.h",
     "gcm_encryption_provider.cc",
     "gcm_encryption_provider.h",
     "gcm_key_store.cc",
     "gcm_key_store.h",
     "gcm_message_cryptographer.cc",
     "gcm_message_cryptographer.h",
-    "gcm_message_cryptographer_nss.cc",
     "gcm_message_cryptographer_openssl.cc",
     "p256_key_util.cc",
     "p256_key_util.h",
-    "p256_key_util_nss.cc",
     "p256_key_util_openssl.cc",
   ]
 
   deps = [
     "//base",
     "//components/gcm_driver/common",
     "//components/gcm_driver/crypto/proto",
     "//components/leveldb_proto",
     "//crypto",
     "//crypto:platform",
     "//net",
     "//third_party/protobuf:protobuf_lite",
   ]
-
-  if (use_openssl) {
-    sources -= [
-      "gcm_message_cryptographer_nss.cc",
-      "p256_key_util_nss.cc",
-    ]
-  } else {
-    sources -= [
-      "gcm_message_cryptographer_openssl.cc",
-      "p256_key_util_openssl.cc",
-    ]
-  }
 }
 
 # GYP version: components/gcm_driver.gypi:gcm_driver_crypto_test_support
 source_set("test_support") {
   testonly = true
   sources = [
     "gcm_crypto_test_helpers.cc",
     "gcm_crypto_test_helpers.h",
   ]
 
@@ skipping 19 matching lines @@
     ":crypto",
     "//base",
     "//base/test:test_support",
     "//components/gcm_driver/common",
     "//crypto",
     "//crypto:platform",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 }