Mojo C++ bindings: InterfacePtr::PassInterface -> PassInterfaceHandle

R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/1677753002 .
diff --git a/examples/indirect_service/indirect_service_demo.cc b/examples/indirect_service/indirect_service_demo.cc
index c354ed8..4fdfb4f 100644
--- a/examples/indirect_service/indirect_service_demo.cc
+++ b/examples/indirect_service/indirect_service_demo.cc
@@ -109,7 +109,7 @@
       // We're passing the integer_service_ proxy to another thread, so
       // use its MessagePipe.
       tasks_.push_back(
-          new DemoTask(integer_service.PassInterface().PassHandle(),
+          new DemoTask(integer_service.PassInterfaceHandle().PassHandle(),
                        finished_callback, kTaskIterationCount));
     }
   }