Making the Mojo Channel Messages legacy mode dynamic.

content/app/mojo/mojo_init.cc

 // Copyright 2014 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 "content/app/mojo/mojo_init.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "content/public/common/content_switches.h"
 #include "ipc/ipc_channel.h"
 #include "mojo/edk/embedder/embedder.h"
 
 namespace content {
 
 namespace {
 
 class MojoInitializer {
  public:
   MojoInitializer() {
     mojo::edk::SetMaxMessageSize(IPC::Channel::kMaximumMessageSize);
+#if defined(OS_CHROMEOS)
+    mojo::edk::SetUseLegacyTransportProtocol(true);
+#endif
     mojo::edk::Init();
   }
 };
 
 base::LazyInstance<MojoInitializer>::Leaky mojo_initializer;
 
 }  //  namespace
 
 void InitializeMojo() {
   mojo_initializer.Get();
 }
 
 }  // namespace content