Make chrome/common pass "gn check"

chrome/third_party/mozilla_security_manager/BUILD.gn

Index: chrome/third_party/mozilla_security_manager/BUILD.gn
diff --git a/chrome/third_party/mozilla_security_manager/BUILD.gn b/chrome/third_party/mozilla_security_manager/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8c14453340514c88973e7bca6fcd66271b9c8ff0
--- /dev/null
+++ b/chrome/third_party/mozilla_security_manager/BUILD.gn
@@ -0,0 +1,19 @@
+# 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.
+
+source_set("mozilla_security_manager") {
+  sources = [
+    "nsNSSCertHelper.cpp",
+    "nsNSSCertHelper.h",
+    "nsNSSCertificate.cpp",
+    "nsNSSCertificate.h",
+    "nsUsageArrayHelper.cpp",
+    "nsUsageArrayHelper.h",
+  ]
+
+  deps = [
+    "//crypto:platform",
+    "//third_party/icu",
+  ]
+}