Bootstrap Mojo IPC independent of Chrome IPC

content/browser/mojo/mojo_shell_client_host.h

Index: content/browser/mojo/mojo_shell_client_host.h
diff --git a/content/browser/mojo/mojo_shell_client_host.h b/content/browser/mojo/mojo_shell_client_host.h
index 8b945fa7a3d403af8c800f214ef895f6691466fd..d9638a2c3c71af5c76e3733ac8197f882ab84475 100644
--- a/content/browser/mojo/mojo_shell_client_host.h
+++ b/content/browser/mojo/mojo_shell_client_host.h
@@ -18,8 +18,14 @@ class RenderProcessHost;
 // child. The server handle of this channel is shared with the external shell
 // via Mojo IPC. |child_process_id| is used to uniquify the child in the
 // external shell's instance map.
-void RegisterChildWithExternalShell(int child_process_id,
-                                    RenderProcessHost* render_process_host);
+//
+// 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,
+    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
@@ -27,10 +33,6 @@ void RegisterChildWithExternalShell(int child_process_id,
 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