Remove openglui embedder code

runtime/embedders/openglui/common/sound_handler.cc

-// 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.
-
-#include "embedders/openglui/common/sound_handler.h"
-
-#include <string.h>
-
-#include "embedders/openglui/common/log.h"
-
-// TODO(gram): Clean up this instance pointer; either make the class
-// a proper singleton or provide a cleaner way for the static functions
-// at the end to access it (those functions are the hooks into the Dart
-// native extension).
-SoundHandler* instance_ = NULL;
-
-SoundHandler::SoundHandler()
-    : samples_() {
-  instance_ = this;
-}
-
-Sample* SoundHandler::GetSample(const char* path) {
-  for (samples_t::iterator sp = samples_.begin();
-       sp != samples_.end();
-       ++sp) {
-    Sample* sample = (*sp);
-    if (strcmp(sample->path(), path) == 0) {
-      LOGI("Returning cached sample %s", path);
-      return sample;
-    }
-  }
-  Sample* sample = new Sample(path);
-  if (sample->Load() != 0) {
-    LOGI("Failed to load sample %s", path);
-    delete sample;
-    return NULL;
-  }
-  samples_.push_back(sample);
-  LOGI("Adding sample %s to cache", path);
-  return sample;
-}
-
-int32_t PlayBackgroundSound(const char* path) {
-  return instance_->PlayBackground(path);
-}
-
-void StopBackgroundSound() {
-  instance_->StopBackground();
-}
-
-int32_t LoadSoundSample(const char* path) {
-  return instance_->LoadSample(path);
-}
-
-int32_t PlaySoundSample(const char* path) {
-  return instance_->PlaySample(path);
-}
-