Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v3/backend_worker.h

Index: net/disk_cache/v3/backend_worker.h
diff --git a/net/disk_cache/v3/backend_worker.h b/net/disk_cache/v3/backend_worker.h
index 42fd4b232f873e4353b419d82bffe1eb8c2ed202..fafb98b50726e91bbf13de7369733455d157e8ad 100644
--- a/net/disk_cache/v3/backend_worker.h
+++ b/net/disk_cache/v3/backend_worker.h
@@ -4,20 +4,20 @@
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
-#ifndef NET_DISK_CACHE_BACKEND_IMPL_H_
-#define NET_DISK_CACHE_BACKEND_IMPL_H_
+#ifndef NET_DISK_CACHE_V3_BACKEND_WORKER_H_
+#define NET_DISK_CACHE_V3_BACKEND_WORKER_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/timer/timer.h"
-#include "net/disk_cache/block_files.h"
 #include "net/disk_cache/disk_cache.h"
-#include "net/disk_cache/eviction.h"
-#include "net/disk_cache/in_flight_backend_io.h"
-#include "net/disk_cache/rankings.h"
-#include "net/disk_cache/stats.h"
-#include "net/disk_cache/stress_support.h"
-#include "net/disk_cache/trace.h"
+#include "net/disk_cache/v2/block_files.h"
+#include "net/disk_cache/v2/eviction.h"
+#include "net/disk_cache/v2/in_flight_backend_io.h"
+#include "net/disk_cache/v2/rankings.h"
+#include "net/disk_cache/v2/stats.h"
+#include "net/disk_cache/v2/stress_support.h"
+#include "net/disk_cache/v2/trace.h"
 
 namespace disk_cache {
 
@@ -57,4 +57,4 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_BACKEND_IMPL_H_
+#endif  // NET_DISK_CACHE_V3_BACKEND_WORKER_H_