mustash: Enable connections to mus from the Chrome renderer [take 2]

content/public/common/mojo_shell_connection.h

Index: content/public/common/mojo_shell_connection.h
diff --git a/content/public/common/mojo_shell_connection.h b/content/public/common/mojo_shell_connection.h
index af4cce1341484871827a2450e83114662ce8155e..6012e377d02786d9f9296cf48206afd0e90db6bd 100644
--- a/content/public/common/mojo_shell_connection.h
+++ b/content/public/common/mojo_shell_connection.h
@@ -6,6 +6,7 @@
 #define CONTENT_PUBLIC_COMMON_MOJO_SHELL_CONNECTION_H_
 
 #include "content/common/content_export.h"
+#include "mojo/public/cpp/system/message_pipe.h"
 
 namespace mojo {
 class ApplicationConnection;
@@ -29,7 +30,6 @@ class CONTENT_EXPORT MojoShellConnection {
     virtual bool ConfigureIncomingConnection(
         mojo::ApplicationConnection* connection) = 0;
 
-   protected:
     virtual ~Listener() {}
   };
 
@@ -47,6 +47,7 @@ class CONTENT_EXPORT MojoShellConnection {
 
   // [De]Register an impl of Listener that will be consulted when the wrapped
   // ApplicationImpl exposes services to inbound connections.
+  // Registered listeners are owned by this MojoShellConnection.
   virtual void AddListener(Listener* listener) = 0;
   virtual void RemoveListener(Listener* listener) = 0;