Fix hangs in Mandoline page cycler on Linux with --enable-multiprocess.

mojo/package_manager/package_manager_impl.cc

Index: mojo/package_manager/package_manager_impl.cc
diff --git a/mojo/package_manager/package_manager_impl.cc b/mojo/package_manager/package_manager_impl.cc
index 73f2c7554876683ecca31d4dd45123dd559bed85..c1880c51453fd7dd9a0fa866cd5d92ce8627aeaf 100644
--- a/mojo/package_manager/package_manager_impl.cc
+++ b/mojo/package_manager/package_manager_impl.cc
@@ -140,8 +140,7 @@ uint32_t PackageManagerImpl::HandleWithContentHandler(
                                      &response)) {
     ContentHandlerConnection* connection =
         GetContentHandler(content_handler_identity, source);
-    connection->content_handler()->StartApplication(application_request->Pass(),
-                                                    response.Pass());
+    connection->StartApplication(application_request->Pass(), response.Pass());
     return connection->id();
   }
   return Shell::kInvalidContentHandlerID;