Remove openglui embedder code

runtime/embedders/openglui/android/android_sound_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_ANDROID_ANDROID_SOUND_HANDLER_H_
-#define EMBEDDERS_OPENGLUI_ANDROID_ANDROID_SOUND_HANDLER_H_
-
-#include <android_native_app_glue.h>
-#include <SLES/OpenSLES.h>
-#include <SLES/OpenSLES_Android.h>
-#include <SLES/OpenSLES_AndroidConfiguration.h>
-#include <vector>
-
-#include "embedders/openglui/common/sample.h"
-#include "embedders/openglui/common/sound_handler.h"
-#include "embedders/openglui/common/types.h"
-
-class AndroidSoundHandler : public SoundHandler {
-  public:
-    explicit AndroidSoundHandler(android_app* application);
-    int32_t Start();
-    void Stop();
-    int32_t Pause();
-    int32_t Resume();
-
-    int32_t PlayBackground(const char* path);
-    void StopBackground();
-
-    int32_t PlaySample(const char* path);
-
-  private:
-    int32_t CreateAudioPlayer(SLEngineItf engine_if,
-                              const SLInterfaceID extra_if,
-                              SLDataSource data_source,
-                              SLDataSink data_sink,
-                              SLObjectItf& player_out,
-                              SLPlayItf& player_if_out);
-
-    int32_t SetBackgroundPlayerState(int state);
-    int32_t StartSamplePlayer();
-
-    android_app* application_;
-    SLObjectItf engine_;
-    SLEngineItf engine_if_;
-    SLObjectItf output_mix_;
-    SLObjectItf background_player_;
-    SLPlayItf background_player_if_;
-    SLSeekItf background_player_seek_if_;
-    SLObjectItf sample_player_;
-    SLPlayItf sample_player_if_;
-    SLBufferQueueItf sample_player_queue_;
-};
-
-#endif  // EMBEDDERS_OPENGLUI_ANDROID_ANDROID_SOUND_HANDLER_H_
-