Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/stress_support.h

Index: net/disk_cache/blockfile/stress_support.h
diff --git a/net/disk_cache/stress_support.h b/net/disk_cache/blockfile/stress_support.h
similarity index 88%
rename from net/disk_cache/stress_support.h
rename to net/disk_cache/blockfile/stress_support.h
index 48d7b5b7df248ca43461df95542ea0fac5c3bbed..5383c5d3e3c6d6429a3c616801e31643e97c093a 100644
--- a/net/disk_cache/stress_support.h
+++ b/net/disk_cache/blockfile/stress_support.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_DISK_CACHE_STRESS_SUPPORT_H_
-#define NET_DISK_CACHE_STRESS_SUPPORT_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_STRESS_SUPPORT_H_
+#define NET_DISK_CACHE_BLOCKFILE_STRESS_SUPPORT_H_
 
 #include "base/logging.h"
 
@@ -36,4 +36,4 @@ namespace disk_cache {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_STRESS_SUPPORT_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_STRESS_SUPPORT_H_