mojo: shell::Context should outlive the shell MessageLoop

mojo/shell/shell_test_base.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SHELL_SHELL_TEST_BASE_H_
 #define MOJO_SHELL_SHELL_TEST_BASE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 30 matching lines @@
 
   ScopedMessagePipeHandle ConnectToServiceViaNetwork(
       const GURL& application_url,
       const std::string& service_name);
 
   base::MessageLoop* message_loop() { return &message_loop_; }
   Context* shell_context() { return &shell_context_; }
 
  private:
   scoped_ptr<net::test_server::EmbeddedTestServer> test_server_;
+  Context shell_context_;
   base::MessageLoop message_loop_;
-  Context shell_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellTestBase);
 };
 
 }  // namespace test
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_SHELL_TEST_BASE_H_