bitmap_uploader: delete dead code

services/ui/public/cpp/bitmap_uploader.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_UI_PUBLIC_CPP_BITMAP_UPLOADER_H_
 #define SERVICES_UI_PUBLIC_CPP_BITMAP_UPLOADER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 60 matching lines @@
   // This may be null if there is an error contacting mus/initializing. We
   // assume we'll be shutting down soon and do nothing in this case.
   std::unique_ptr<ui::GLES2Context> gles2_context_;
 
   uint32_t color_;
   int width_;
   int height_;
   Format format_;
   std::unique_ptr<std::vector<unsigned char>> bitmap_;
   uint32_t next_resource_id_;
-  uint32_t id_namespace_;
   base::hash_map<uint32_t, uint32_t> resource_to_texture_id_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BitmapUploader);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_PUBLIC_CPP_BITMAP_UPLOADER_H_