Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/experiments.h

Index: net/disk_cache/blockfile/experiments.h
diff --git a/net/disk_cache/experiments.h b/net/disk_cache/blockfile/experiments.h
similarity index 83%
rename from net/disk_cache/experiments.h
rename to net/disk_cache/blockfile/experiments.h
index d7d4e58437b24d9185e157ea1d21572d576793db..53b6582b0d7dfab650ad8060a147b51e3f61c77c 100644
--- a/net/disk_cache/experiments.h
+++ b/net/disk_cache/blockfile/experiments.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_EXPERIMENTS_H_
-#define NET_DISK_CACHE_EXPERIMENTS_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_EXPERIMENTS_H_
+#define NET_DISK_CACHE_BLOCKFILE_EXPERIMENTS_H_
 
 
 namespace disk_cache {
@@ -25,4 +25,4 @@ enum {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_EXPERIMENTS_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_EXPERIMENTS_H_