Remove openglui embedder code

runtime/embedders/openglui/emulator/emulator_resource.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_EMULATOR_EMULATOR_RESOURCE_H_
-#define EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_RESOURCE_H_
-
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "embedders/openglui/common/log.h"
-#include "embedders/openglui/common/resource.h"
-
-class EmulatorResource : public Resource {
-  public:
-    explicit EmulatorResource(const char* path)
-      : Resource(path),
-        fd_(-1) {
-    }
-
-    int32_t descriptor() {
-      if (fd_ < 0) {
-        Open();
-      }
-      return fd_;
-    }
-
-    off_t length() {
-      if (length_ < 0) {
-        length_ = lseek(fd_, 0, SEEK_END);
-        lseek(fd_, 0, SEEK_SET);
-      }
-      return length_;
-    }
-
-    int32_t Open() {
-      fd_ = open(path_, 0);
-      if (fd_ >= 0) {
-        return 0;
-      }
-      LOGE("Could not open asset %s", path_);
-      return -1;
-    }
-
-    void Close() {
-      if (fd_ >= 0) {
-        close(fd_);
-        fd_ = -1;
-      }
-    }
-
-    int32_t Read(void* buffer, size_t count) {
-      size_t actual = read(fd_, buffer, count);
-      return (actual == count) ? 0 : -1;
-    }
-
-  private:
-    int fd_;
-};
-
-#endif  // EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_RESOURCE_H_
-