Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/in_flight_backend_io.cc

Index: net/disk_cache/blockfile/in_flight_backend_io.cc
diff --git a/net/disk_cache/in_flight_backend_io.cc b/net/disk_cache/blockfile/in_flight_backend_io.cc
similarity index 98%
rename from net/disk_cache/in_flight_backend_io.cc
rename to net/disk_cache/blockfile/in_flight_backend_io.cc
index a83e2cf560ee0c9074b2bb3506bea500bbcaed16..8f76650a4254203d9fe0ffbc606c019f4c087c36 100644
--- a/net/disk_cache/in_flight_backend_io.cc
+++ b/net/disk_cache/blockfile/in_flight_backend_io.cc
@@ -2,18 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/disk_cache/in_flight_backend_io.h"
+#include "net/disk_cache/blockfile/in_flight_backend_io.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "net/base/net_errors.h"
-#include "net/disk_cache/backend_impl.h"
-#include "net/disk_cache/entry_impl.h"
+#include "net/disk_cache/blockfile/backend_impl.h"
+#include "net/disk_cache/blockfile/entry_impl.h"
 
 #define CACHE_HISTOGRAM_MACROS_BACKEND_IMPL_OBJ backend_
-#include "net/disk_cache/histogram_macros.h"
+#include "net/disk_cache/blockfile/histogram_macros.h"
 
 namespace disk_cache {