Remove openglui embedder code

runtime/embedders/openglui/emulator/emulator_graphics_handler.h

Index: runtime/embedders/openglui/emulator/emulator_graphics_handler.h
diff --git a/runtime/embedders/openglui/emulator/emulator_graphics_handler.h b/runtime/embedders/openglui/emulator/emulator_graphics_handler.h
deleted file mode 100644
index 4a2927098a735fd118c3b39f9768492df6fb4ad0..0000000000000000000000000000000000000000
--- a/runtime/embedders/openglui/emulator/emulator_graphics_handler.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_GRAPHICS_HANDLER_H_
-#define EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_GRAPHICS_HANDLER_H_
-
-#include "embedders/openglui/common/graphics_handler.h"
-
-class EmulatorGraphicsHandler : public GraphicsHandler {
-  public:
-    EmulatorGraphicsHandler(int argc, char** argv);
-
-    int32_t Start();
-    void Stop();
-};
-
-#endif  // EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_GRAPHICS_HANDLER_H_
-