Reorganize net/disk_cache into backend specific directories.

net/disk_cache/tracing/tracing_cache_backend.h

Index: net/disk_cache/tracing/tracing_cache_backend.h
diff --git a/net/disk_cache/tracing_cache_backend.h b/net/disk_cache/tracing/tracing_cache_backend.h
similarity index 91%
rename from net/disk_cache/tracing_cache_backend.h
rename to net/disk_cache/tracing/tracing_cache_backend.h
index 304a7334d8340d5ab84861aed1412397b2349d38..b8d18696f54019330c925b2cf2f9728d95165ad0 100644
--- a/net/disk_cache/tracing_cache_backend.h
+++ b/net/disk_cache/tracing/tracing_cache_backend.h
@@ -2,12 +2,15 @@
 // 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_CACHE_BACKEND_H_
-#define NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_
+#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"
-#include "net/disk_cache/stats.h"
 
 namespace disk_cache {
 
@@ -78,4 +81,4 @@ class NET_EXPORT TracingCacheBackend : public Backend,
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_
+#endif  // NET_DISK_CACHE_TRACING_TRACING_CACHE_BACKEND_H_