Remove openglui embedder code

runtime/embedders/openglui/common/sample.h

-// 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_COMMON_SAMPLE_H_
-#define EMBEDDERS_OPENGLUI_COMMON_SAMPLE_H_
-
-#include "embedders/openglui/common/resource.h"
-
-extern Resource* MakePlatformResource(const char *path);
-
-class Sample {
-  public:
-    explicit Sample(const char* path)
-        : buffer_(NULL),
-          length_(0) {
-      resource_ = MakePlatformResource(path);
-    }
-
-    ~Sample() {
-      Unload();
-      delete resource_;
-    }
-
-    const char* path() {
-      return resource_->path();
-    }
-
-    uint8_t* buffer() {
-      return buffer_;
-    }
-
-    off_t length() {
-      return length_;
-    }
-
-    int32_t Load() {
-      int32_t rtn = -1;
-      if (resource_->Open() == 0) {
-        buffer_ = new uint8_t[length_ = resource_->length()];
-        rtn = resource_->Read(buffer_, length_);
-        resource_->Close();
-      }
-      return rtn;
-    }
-
-    void Unload() {
-      if (buffer_ != NULL) {
-        delete[] buffer_;
-        buffer_ = NULL;
-      }
-      length_ = 0;
-    }
-
-  private:
-    friend class SoundService;
-    Resource* resource_;
-    uint8_t* buffer_;
-    off_t length_;
-};
-
-#endif  // EMBEDDERS_OPENGLUI_COMMON_SAMPLE_H_
-