Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v2/rankings.cc

Index: net/disk_cache/v2/rankings.cc
diff --git a/net/disk_cache/rankings.cc b/net/disk_cache/v2/rankings.cc
similarity index 98%
rename from net/disk_cache/rankings.cc
rename to net/disk_cache/v2/rankings.cc
index ff9913e252aea37d54a9f62876255374a4e68a98..355c5f54aea125eeee47119bf3124b85c779aab2 100644
--- a/net/disk_cache/rankings.cc
+++ b/net/disk_cache/v2/rankings.cc
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/disk_cache/rankings.h"
+#include "net/disk_cache/v2/rankings.h"
 
 #include "base/metrics/histogram.h"
-#include "net/disk_cache/backend_impl.h"
-#include "net/disk_cache/disk_format.h"
-#include "net/disk_cache/entry_impl.h"
-#include "net/disk_cache/errors.h"
-#include "net/disk_cache/histogram_macros.h"
-#include "net/disk_cache/stress_support.h"
+#include "net/disk_cache/v2/backend_impl.h"
+#include "net/disk_cache/v2/disk_format.h"
+#include "net/disk_cache/v2/entry_impl.h"
+#include "net/disk_cache/v2/errors.h"
+#include "net/disk_cache/v2/histogram_macros.h"
+#include "net/disk_cache/v2/stress_support.h"
 
 using base::Time;
 using base::TimeTicks;