[NTP::Push] Add the classes for sending a breaking news subscription request

components/ntp_snippets/breaking_news/subscription_request_params.cc

Index: components/ntp_snippets/breaking_news/subscription_request_params.cc
diff --git a/components/ntp_snippets/breaking_news/subscription_request_params.cc b/components/ntp_snippets/breaking_news/subscription_request_params.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4f43c18a8f234ecd6f853166a2fbba9c5a1b72fc
--- /dev/null
+++ b/components/ntp_snippets/breaking_news/subscription_request_params.cc
@@ -0,0 +1,14 @@
+// Copyright 2017 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.
+
+#include "components/ntp_snippets/breaking_news/subscription_request_params.h"
+
+namespace ntp_snippets {
+
+SubscriptionRequestParams::SubscriptionRequestParams() = default;
+SubscriptionRequestParams::SubscriptionRequestParams(
+    const SubscriptionRequestParams&) = default;
+SubscriptionRequestParams::~SubscriptionRequestParams() = default;
+
+}  // namespace ntp_snippets