Revert of Bootstrap Mojo IPC independent of Chrome IPC

content/browser/mojo/mojo_shell_client_host.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 CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_
 #define CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_
 
 #include <string>
 
 #include "base/process/process_handle.h"
 #include "mojo/shell/public/interfaces/shell.mojom.h"
 
 namespace content {
 
 class RenderProcessHost;
 
 // Creates a communication channel between the external Mojo shell and the
 // child. The server handle of this channel is shared with the external shell
 // via Mojo IPC. |child_process_id| and |instance_id| are used to uniquify the
 // child in the external shell's instance map.
-//
-// This returns a token that may be passed to the child process and exchanged
-// for a pipe there. That pipe can in turn be passed to
-// MojoShellConnectionImpl::BindToMessagePipe() to initialize the child's
-// shell connection.
-std::string RegisterChildWithExternalShell(
-    int child_process_id,
-    int instance_id,
-    RenderProcessHost* render_process_host);
+void RegisterChildWithExternalShell(int child_process_id,
+                                    int instance_id,
+                                    RenderProcessHost* render_process_host);
 
 // Returns the URL associated with an instance corresponding to the renderer
 // process in the external shell. This URL can be passed to
 // ConnectToApplication() to open a new connection to this renderer.
 std::string GetMojoApplicationInstanceURL(
     RenderProcessHost* render_process_host);
 
+// Shares a client handle to the Mojo Shell with the child via Chrome IPC.
+void SendExternalMojoShellHandleToChild(base::ProcessHandle process_handle,
+                                        RenderProcessHost* render_process_host);
+
 // Constructs a Capability Filter for the renderer's application instance in the
 // external shell. This contains the restrictions imposed on what applications
 // and interfaces the renderer can see. The implementation lives in
 // renderer_capability_filter.cc so that it can be subject to specific security
 // review.
 mojo::shell::mojom::CapabilityFilterPtr CreateCapabilityFilterForRenderer();
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_