Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v2/rankings.h

Index: net/disk_cache/v2/rankings.h
diff --git a/net/disk_cache/rankings.h b/net/disk_cache/v2/rankings.h
similarity index 96%
rename from net/disk_cache/rankings.h
rename to net/disk_cache/v2/rankings.h
index cd94eaf1c59b148718a7d9b3e3a857a98c4b8ff3..3174dfc500dd1b1a38837ceb5a8ba65cd398807d 100644
--- a/net/disk_cache/rankings.h
+++ b/net/disk_cache/v2/rankings.h
@@ -4,15 +4,15 @@
 
 // See net/disk_cache/disk_cache.h for the public interface.
 
-#ifndef NET_DISK_CACHE_RANKINGS_H_
-#define NET_DISK_CACHE_RANKINGS_H_
+#ifndef NET_DISK_CACHE_V2_RANKINGS_H_
+#define NET_DISK_CACHE_V2_RANKINGS_H_
 
 #include <list>
 
 #include "base/memory/scoped_ptr.h"
-#include "net/disk_cache/addr.h"
-#include "net/disk_cache/mapped_file.h"
-#include "net/disk_cache/storage_block.h"
+#include "net/disk_cache/v2/addr.h"
+#include "net/disk_cache/v2/mapped_file.h"
+#include "net/disk_cache/v2/storage_block.h"
 
 namespace disk_cache {
 
@@ -211,4 +211,4 @@ class Rankings {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_RANKINGS_H_
+#endif  // NET_DISK_CACHE_V2_RANKINGS_H_