Revert of Move content's shell connections to the IO thread

services/shell/public/cpp/connector.h

Index: services/shell/public/cpp/connector.h
diff --git a/services/shell/public/cpp/connector.h b/services/shell/public/cpp/connector.h
index bfd3c19821fe38fc57819edb91fea29d09079154..9db076d5f1db6f3460cf5342e97f73aa29df794d 100644
--- a/services/shell/public/cpp/connector.h
+++ b/services/shell/public/cpp/connector.h
@@ -72,10 +72,6 @@
     DISALLOW_COPY_AND_ASSIGN(ConnectParams);
   };
 
-  // Creates a new Connector instance and fills in |*request| with a request
-  // for the other end the Connector's interface.
-  static std::unique_ptr<Connector> Create(mojom::ConnectorRequest* request);
-
   // Requests a new connection to an application. Returns a pointer to the
   // connection if the connection is permitted by this application's delegate,
   // or nullptr otherwise. Caller takes ownership.