Remove openglui embedder code

runtime/embedders/openglui/common/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_COMMON_SOUND_HANDLER_H_
-#define EMBEDDERS_OPENGLUI_COMMON_SOUND_HANDLER_H_
-
-#include <stdint.h>
-#include <vector>
-
-#include "embedders/openglui/common/sample.h"
-
-class SoundHandler {
-  public:
-    SoundHandler();
-
-    virtual ~SoundHandler() {
-    }
-
-    virtual int32_t Start() {
-      return 0;
-    }
-
-    virtual void Stop() {
-    }
-
-    virtual int32_t Suspend() {
-      return 0;
-    }
-
-    virtual int32_t Resume() {
-      return 0;
-    }
-
-    virtual int32_t PlayBackground(const char* path) {
-      return 0;
-    }
-
-    virtual void StopBackground() {
-    }
-
-    // Optional, for preloading.
-    int32_t LoadSample(const char* path) {
-       return (GetSample(path) == NULL) ? -1 : 0;
-    }
-
-    virtual int32_t PlaySample(const char* path) {
-      // Just do a load so we can get logging.
-      return (GetSample(path) == NULL) ? -1 : 0;
-    }
-
-  protected:
-    typedef std::vector<Sample*> samples_t;
-
-    Sample* GetSample(const char* path);
-
-    samples_t samples_;
-};
-
-int32_t PlayBackgroundSound(const char* path);
-void StopBackgroundSound();
-int32_t LoadSoundSample(const char* path);
-int32_t PlaySoundSample(const char* path);
-
-#endif  // EMBEDDERS_OPENGLUI_COMMON_SOUND_HANDLER_H_
-