Extract ScopedTestNSSDB from nss_util.

crypto/BUILD.gn

Index: crypto/BUILD.gn
diff --git a/crypto/BUILD.gn b/crypto/BUILD.gn
index bd7f06d0e4830dcbf121f822a69318a6977c3dc5..6871bda0f7377134a53ee2c4ef7ec6b66571fbe3 100644
--- a/crypto/BUILD.gn
+++ b/crypto/BUILD.gn
@@ -131,6 +131,7 @@ component("crypto") {
       "hmac_nss.cc",
       "nss_util.cc",
       "nss_util.h",
+      "nss_util_internal.h",
       "rsa_private_key_nss.cc",
       "secure_hash_default.cc",
       "signature_creator_nss.cc",
@@ -229,6 +230,7 @@ test("crypto_unittests") {
   deps = [
     ":crypto",
     ":platform",
+    ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
@@ -237,6 +239,38 @@ test("crypto_unittests") {
   ]
 }
 
+source_set("test_support") {
+  sources = [
+    "scoped_test_nss_db.cc",
+    "scoped_test_nss_db.h",
+    "scoped_test_nss_chromeos_user.cc",
+    "scoped_test_nss_chromeos_user.h",
+    "scoped_test_system_nss_key_slot.cc",
+    "scoped_test_system_nss_key_slot.h",
+  ]
+  deps = [
+    ":crypto",
+    ":platform",
+    "//base",
+  ]
+
+  if (!use_nss_certs) {
+    sources -= [
+      "scoped_test_nss_db.cc",
+      "scoped_test_nss_db.h",
+    ]
+  }
+
+  if (!is_chromeos) {
+    sources -= [
+      "scoped_test_nss_chromeos_user.cc",
+      "scoped_test_nss_chromeos_user.h",
+      "scoped_test_system_nss_key_slot.cc",
+      "scoped_test_system_nss_key_slot.h",
+    ]
+  }
+}
+
 # This is a meta-target that forwards to NSS's SSL library or OpenSSL,
 # according to the state of the crypto flags. A target just wanting to depend
 # on the current SSL library should just depend on this.