Reorganize net/disk_cache into backend specific directories.

net/disk_cache/trace.h

-// Copyright (c) 2011 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.
-
-// This file provides support for basic in-memory tracing of short events. We
-// keep a static circular buffer where we store the last traced events, so we
-// can review the cache recent behavior should we need it.
-
-#ifndef NET_DISK_CACHE_TRACE_H__
-#define NET_DISK_CACHE_TRACE_H__
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "net/base/net_export.h"
-
-namespace disk_cache {
-
-// Create and destroy the tracing buffer.
-void InitTrace(void);
-void DestroyTrace(void);
-
-// Simple class to handle the trace buffer lifetime. Any object interested in
-// tracing should keep a reference to the object returned by GetTraceObject().
-class TraceObject : public base::RefCounted<TraceObject> {
-  friend class base::RefCounted<TraceObject>;
- public:
-  static TraceObject* GetTraceObject();
-  void EnableTracing(bool enable);
-
- private:
-  TraceObject();
-  ~TraceObject();
-  DISALLOW_COPY_AND_ASSIGN(TraceObject);
-};
-
-// Traces to the internal buffer.
-NET_EXPORT_PRIVATE void Trace(const char* format, ...);
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_TRACE_H__