Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/rankings.cc

Index: net/disk_cache/blockfile/rankings.cc
diff --git a/net/disk_cache/rankings.cc b/net/disk_cache/blockfile/rankings.cc
similarity index 98%
rename from net/disk_cache/rankings.cc
rename to net/disk_cache/blockfile/rankings.cc
index b648776fd5bee4358f0372bfe66d79303045d725..26171bc9b17077e4b1bb7de78ee949587f782103 100644
--- a/net/disk_cache/rankings.cc
+++ b/net/disk_cache/blockfile/rankings.cc
@@ -2,19 +2,20 @@
 // 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/blockfile/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/stress_support.h"
+#include "net/disk_cache/blockfile/backend_impl.h"
+#include "net/disk_cache/blockfile/disk_format.h"
+#include "net/disk_cache/blockfile/entry_impl.h"
+#include "net/disk_cache/blockfile/errors.h"
+#include "net/disk_cache/blockfile/stress_support.h"
 
 // Define BLOCKFILE_BACKEND_IMPL_OBJ to be a disk_cache::BackendImpl* in order
 // to use the CACHE_UMA histogram macro.
 #define BLOCKFILE_BACKEND_IMPL_OBJ backend_
-#include "net/disk_cache/histogram_macros.h"
+#include "net/disk_cache/blockfile/histogram_macros.h"
+
 
 using base::Time;
 using base::TimeTicks;