mus: Use BufferQueue and GLHelper from display_compositor.

components/mus/gles2/gl_helper.h

Index: components/mus/gles2/gl_helper.h
diff --git a/components/mus/gles2/gl_helper.h b/components/mus/gles2/gl_helper.h
deleted file mode 100644
index e067cb3accd9f0ff4a08bd671ff7dff9e6aea9da..0000000000000000000000000000000000000000
--- a/components/mus/gles2/gl_helper.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2016 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 COMPONENTS_MUS_GLES2_GL_HELPER_H_
-#define COMPONENTS_MUS_GLES2_GL_HELPER_H_
-
-#include "gpu/command_buffer/client/gles2_interface.h"
-
-class SkRegion;
-
-namespace mus {
-
-void GLCopySubBufferDamage(gpu::gles2::GLES2Interface* gl,
-                           GLenum target,
-                           GLuint texture,
-                           GLuint previous_texture,
-                           const SkRegion& new_damage,
-                           const SkRegion& old_damage);
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_GLES2_GL_HELPER_H_