gpu shader cache: Make ShaderClearHelper non-refcounted.

content/browser/gpu/shader_disk_cache.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_
 #define CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 137 matching lines @@
   ~ShaderCacheFactory();
 
   static void CreateFactoryInstance(
       scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
 
   scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner_;
 
   scoped_refptr<ShaderDiskCache> GetByPath(const base::FilePath& path);
   void CacheCleared(const base::FilePath& path);
 
-  typedef std::map<base::FilePath, ShaderDiskCache*> ShaderCacheMap;
+  using ShaderCacheMap = std::map<base::FilePath, ShaderDiskCache*>;
   ShaderCacheMap shader_cache_map_;
 
-  typedef std::map<int32_t, base::FilePath> ClientIdToPathMap;
+  using ClientIdToPathMap = std::map<int32_t, base::FilePath>;
   ClientIdToPathMap client_id_to_path_map_;
 
-  typedef std::queue<scoped_refptr<ShaderClearHelper> > ShaderClearQueue;
-  typedef std::map<base::FilePath, ShaderClearQueue> ShaderClearMap;
+  using ShaderClearQueue = std::queue<std::unique_ptr<ShaderClearHelper>>;
+  using ShaderClearMap = std::map<base::FilePath, ShaderClearQueue>;
   ShaderClearMap shader_clear_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ShaderCacheFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_