Add Chromium environment application test support.

mojo/environment/default_run_loop_impl.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_ENVIRONMENT_DEFAULT_LOGGER_IMPL_H_
-#define MOJO_ENVIRONMENT_DEFAULT_LOGGER_IMPL_H_
+#ifndef MOJO_ENVIRONMENT_DEFAULT_RUN_LOOP_IMPL_H_
+#define MOJO_ENVIRONMENT_DEFAULT_RUN_LOOP_IMPL_H_
 
 #include "mojo/environment/mojo_environment_impl_export.h"
-#include "mojo/public/c/environment/logger.h"
 
 namespace mojo {
 namespace internal {
 
-MOJO_ENVIRONMENT_IMPL_EXPORT const MojoLogger* GetDefaultLoggerImpl();
+MOJO_ENVIRONMENT_IMPL_EXPORT void InstantiateDefaultRunLoopImpl();
+MOJO_ENVIRONMENT_IMPL_EXPORT void DestroyDefaultRunLoopImpl();
 
 }  // namespace internal
 }  // namespace mojo
 
-#endif  // MOJO_ENVIRONMENT_DEFAULT_LOGGER_IMPL_H_
+#endif  // MOJO_ENVIRONMENT_DEFAULT_RUN_LOOP_IMPL_H_