Mojo: Make GetDefault{AsyncWaiter,Logger} static methods of Environment.

mojo/public/cpp/environment/default_logger.h

Index: mojo/public/cpp/environment/default_logger.h
diff --git a/mojo/public/cpp/environment/default_logger.h b/mojo/public/cpp/environment/default_logger.h
deleted file mode 100644
index b0223937666d40c69a7086dcd83310ac9583f7e2..0000000000000000000000000000000000000000
--- a/mojo/public/cpp/environment/default_logger.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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_PUBLIC_CPP_ENVIRONMENT_DEFAULT_LOGGER_H_
-#define MOJO_PUBLIC_CPP_ENVIRONMENT_DEFAULT_LOGGER_H_
-
-#include "mojo/public/c/environment/logger.h"
-
-namespace mojo {
-
-// Returns a default implementation of |MojoLogger|.
-const MojoLogger* GetDefaultLogger();
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_ENVIRONMENT_DEFAULT_LOGGER_H_