Remove the tracing cache backend.

net/disk_cache/tracing/tracing_cache_backend.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 NET_DISK_CACHE_TRACING_TRACING_CACHE_BACKEND_H_
-#define NET_DISK_CACHE_TRACING_TRACING_CACHE_BACKEND_H_
-
-#include <map>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "net/disk_cache/blockfile/stats.h"
-#include "net/disk_cache/disk_cache.h"
-
-namespace disk_cache {
-
-class EntryProxy;
-
-// The TracingCacheBackend implements the Cache Backend interface. It intercepts
-// all backend operations from the IO thread and records the time from the start
-// of the operation until the result is delivered.
-class NET_EXPORT TracingCacheBackend : public Backend,
-    public base::SupportsWeakPtr<TracingCacheBackend> {
- public:
-  explicit TracingCacheBackend(scoped_ptr<Backend> backend);
-
-  virtual net::CacheType GetCacheType() const OVERRIDE;
-  virtual int32 GetEntryCount() const OVERRIDE;
-  virtual int OpenEntry(const std::string& key, Entry** entry,
-                        const CompletionCallback& callback) OVERRIDE;
-  virtual int CreateEntry(const std::string& key, Entry** entry,
-                          const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntry(const std::string& key,
-                        const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesBetween(base::Time initial_time,
-                                 base::Time end_time,
-                                 const CompletionCallback& callback) OVERRIDE;
-  virtual int DoomEntriesSince(base::Time initial_time,
-                               const CompletionCallback& callback) OVERRIDE;
-  virtual int OpenNextEntry(void** iter, Entry** next_entry,
-                            const CompletionCallback& callback) OVERRIDE;
-  virtual void EndEnumeration(void** iter) OVERRIDE;
-  virtual void GetStats(StatsItems* stats) OVERRIDE;
-  virtual void OnExternalCacheHit(const std::string& key) OVERRIDE;
-
- private:
-  friend class EntryProxy;
-  enum Operation {
-    OP_OPEN,
-    OP_CREATE,
-    OP_DOOM_ENTRY,
-    OP_READ,
-    OP_WRITE
-  };
-
-  virtual ~TracingCacheBackend();
-
-  EntryProxy* FindOrCreateEntryProxy(Entry* entry);
-
-  void OnDeleteEntry(Entry* e);
-
-  void RecordEvent(base::TimeTicks start_time, Operation op, std::string key,
-                   Entry* entry, int result);
-
-  void BackendOpComplete(base::TimeTicks start_time, Operation op,
-                         std::string key, Entry** entry,
-                         const CompletionCallback& callback, int result);
-
-  net::CompletionCallback BindCompletion(Operation op,
-                                         base::TimeTicks start_time,
-                                         const std::string& key, Entry **entry,
-                                         const net::CompletionCallback& cb);
-
-  scoped_ptr<Backend> backend_;
-  typedef std::map<Entry*, EntryProxy*> EntryToProxyMap;
-  EntryToProxyMap open_entries_;
-
-  DISALLOW_COPY_AND_ASSIGN(TracingCacheBackend);
-};
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_TRACING_TRACING_CACHE_BACKEND_H_