Remove some InterfacePtr<> methods which directly deal with message pipe handles.

services/dart/content_handler_app_service_connector.cc

Index: services/dart/content_handler_app_service_connector.cc
diff --git a/services/dart/content_handler_app_service_connector.cc b/services/dart/content_handler_app_service_connector.cc
index 7b4b258c7a8b5aef2ee60094122e6aa5558b6c8a..86d133e958b913a8b74b9700ddb06d7b6a1a4029 100644
--- a/services/dart/content_handler_app_service_connector.cc
+++ b/services/dart/content_handler_app_service_connector.cc
@@ -53,7 +53,7 @@ MojoHandle ContentHandlerAppServiceConnector::ConnectToService(
           application_name,
           base::Passed(GetProxy(&interface_ptr))));
       // Return proxy end of pipe to caller.
-      return interface_ptr.PassMessagePipe().release().value();
+      return interface_ptr.PassInterface().PassHandle().release().value();
     }
     break;
     default: