Make ppapi/proxy child-process only

ppapi/proxy/tcp_socket_resource_constants.cc

+// 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 "ppapi/proxy/tcp_socket_resource_constants.h"
+
+namespace ppapi {
+namespace proxy {
+
+const int32_t TCPSocketResourceConstants::kMaxReadSize = 1024 * 1024;
+const int32_t TCPSocketResourceConstants::kMaxWriteSize = 1024 * 1024;
+const int32_t TCPSocketResourceConstants::kMaxSendBufferSize =
+    1024 * TCPSocketResourceConstants::kMaxWriteSize;
+const int32_t TCPSocketResourceConstants::kMaxReceiveBufferSize =
+    1024 * TCPSocketResourceConstants::kMaxReadSize;
+
+}  // namespace proxy
+}  // namespace ppapi