Rename mojo::TokenSerializer to mojo::Broker.

mojo/edk/system/simple_broker.h

 // 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.
 
-#ifndef MOJO_EDK_SYSTEM_SIMPLE_TOKEN_SERIALIZER_WIN_H_
-#define MOJO_EDK_SYSTEM_SIMPLE_TOKEN_SERIALIZER_WIN_H_
+#ifndef MOJO_EDK_SYSTEM_SIMPLE_BROKER_H_
+#define MOJO_EDK_SYSTEM_SIMPLE_BROKER_H_
 
-#include "mojo/edk/system/token_serializer_win.h"
+#include "mojo/edk/system/broker.h"
 
 namespace mojo {
 namespace edk {
 
-// A simple implementation of TokenSerializer interface. This isn't meant for
-// production use (i.e. with multi-process, sandboxes). It's provided for use by
-// unittests.
+// A simple implementation of Broker interface. This isn't meant for production
+// use (i.e. with multi-process, sandboxes). It's provided for use by unittests.
 // Implementation note: this default implementation works across processes
 // without a sandbox.
-class MOJO_SYSTEM_IMPL_EXPORT SimpleTokenSerializer : public TokenSerializer {
+class MOJO_SYSTEM_IMPL_EXPORT SimpleBroker : public Broker {
  public:
-  SimpleTokenSerializer();
-  ~SimpleTokenSerializer() override;
+  SimpleBroker();
+  ~SimpleBroker() override;
 
-  // TokenSerializer implementation:
+  // Broker implementation:
+#if defined(OS_WIN)
   void CreatePlatformChannelPair(ScopedPlatformHandle* server,
                                  ScopedPlatformHandle* client) override;
   void HandleToToken(const PlatformHandle* platform_handles,
                      size_t count,
                      uint64_t* tokens) override;
   void TokenToHandle(const uint64_t* tokens,
                      size_t count,
                      PlatformHandle* handles) override;
+#endif
 };
 
 }  // namespace edk
 }  // namespace mojo
 
-#endif  // MOJO_EDK_SYSTEM_SIMPLE_TOKEN_SERIALIZER_WIN_H_
+#endif  // MOJO_EDK_SYSTEM_SIMPLE_BROKER_H_