Revert of Use a token to initialise ChannelMojo and MojoApplication everywhere.

content/common/mojo/mojo_messages.h

Index: content/common/mojo/mojo_messages.h
diff --git a/content/common/mojo/mojo_messages.h b/content/common/mojo/mojo_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..1232902be37c8f1fe0eedca64405758ed5eff861
--- /dev/null
+++ b/content/common/mojo/mojo_messages.h
@@ -0,0 +1,22 @@
+// Copyright (c) 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.
+
+// IPC messages for mojo.
+// Multiply-included message file, hence no include guard.
+
+#include "content/common/content_export.h"
+#include "content/public/common/common_param_traits.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+#include "ipc/ipc_param_traits.h"
+#include "ipc/ipc_platform_file.h"
+#include "ipc/param_traits_macros.h"
+
+#undef IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_EXPORT CONTENT_EXPORT
+#define IPC_MESSAGE_START MojoMsgStart
+
+// Mojo IPC is bootstrapped over Chrome IPC via this message.
+IPC_MESSAGE_CONTROL1(MojoMsg_Activate,
+                     IPC::PlatformFileForTransit /* handle */)