Support getting and deleting token for Instance ID.

google_apis/gcm/engine/gcm_registration_request_handler.cc

+// 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.
+
+#include "google_apis/gcm/engine/gcm_registration_request_handler.h"
+
+#include "google_apis/gcm/base/gcm_util.h"
+
+namespace gcm {
+
+namespace {
+
+// Request constants.
+const char kSenderKey[] = "sender";
+
+}  // namespace
+
+GCMRegistrationRequestHandler::GCMRegistrationRequestHandler(
+    const std::string& senders)
+    : senders_(senders) {
+}
+
+GCMRegistrationRequestHandler::~GCMRegistrationRequestHandler() {}
+
+void GCMRegistrationRequestHandler::BuildRequestBody(std::string* body){
+  BuildFormEncoding(kSenderKey, senders_, body);
+}
+
+}  // namespace gcm