Remove openglui embedder code

runtime/embedders/openglui/common/input_handler.h

-// Copyright (c) 2012, 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_COMMON_INPUT_HANDLER_H_
-#define EMBEDDERS_OPENGLUI_COMMON_INPUT_HANDLER_H_
-
-#include "embedders/openglui/common/events.h"
-#include "embedders/openglui/common/vm_glue.h"
-
-class InputHandler {
-  public:
-    explicit InputHandler(VMGlue* vm_glue);
-    virtual int32_t Start() { return 0; }
-    virtual void Stop() { }
-    virtual int OnMotionEvent(MotionEvent event, int64_t when,
-                    float move_x, float move_y);
-    virtual int OnKeyEvent(KeyEvent event, int64_t when, int32_t key_code,
-                           bool isAltKeyDown, bool isCtrlKeyDown,
-                           bool isShiftKeyDown, int32_t repeat);
-    virtual void OnAccelerometerEvent(float x, float y, float z);
-
-    virtual ~InputHandler() {}
-
-  protected:
-    VMGlue* vm_glue_;
-};
-
-#endif  // EMBEDDERS_OPENGLUI_COMMON_INPUT_HANDLER_H_
-