Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/block_files.cc

Index: net/disk_cache/blockfile/block_files.cc
diff --git a/net/disk_cache/block_files.cc b/net/disk_cache/blockfile/block_files.cc
similarity index 99%
rename from net/disk_cache/block_files.cc
rename to net/disk_cache/blockfile/block_files.cc
index d8d13e8f2bf440e5d2d68423c88cc50a87baf33a..d2c1ffbc9c270210ff466f069f39c842fad1d4f4 100644
--- a/net/disk_cache/block_files.cc
+++ b/net/disk_cache/blockfile/block_files.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/block_files.h"
+#include "net/disk_cache/blockfile/block_files.h"
 
 #include "base/atomicops.h"
 #include "base/files/file_path.h"
@@ -11,9 +11,9 @@
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
+#include "net/disk_cache/blockfile/file_lock.h"
+#include "net/disk_cache/blockfile/trace.h"
 #include "net/disk_cache/cache_util.h"
-#include "net/disk_cache/file_lock.h"
-#include "net/disk_cache/trace.h"
 
 using base::TimeTicks;