Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v2/backend_impl.cc

Index: net/disk_cache/v2/backend_impl.cc
diff --git a/net/disk_cache/backend_impl.cc b/net/disk_cache/v2/backend_impl.cc
similarity index 99%
rename from net/disk_cache/backend_impl.cc
rename to net/disk_cache/v2/backend_impl.cc
index d10a19d9af09e76c553c99c9a54d07a0d8c30f6a..5bb65f2ac1793560dcec17815d43e86f6644b14b 100644
--- a/net/disk_cache/backend_impl.cc
+++ b/net/disk_cache/v2/backend_impl.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/disk_cache/backend_impl.h"
+#include "net/disk_cache/v2/backend_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ -22,15 +22,15 @@
 #include "base/timer/timer.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/cache_util.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/experiments.h"
-#include "net/disk_cache/file.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/experiments.h"
+#include "net/disk_cache/v2/file.h"
 
 // This has to be defined before including histogram_macros.h from this file.
-#define NET_DISK_CACHE_BACKEND_IMPL_CC_
-#include "net/disk_cache/histogram_macros.h"
+#define NET_DISK_CACHE_V2_BACKEND_IMPL_CC_
+#include "net/disk_cache/v2/histogram_macros.h"
 
 using base::Time;
 using base::TimeDelta;