Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/mapped_file.h

Index: net/disk_cache/blockfile/mapped_file.h
diff --git a/net/disk_cache/mapped_file.h b/net/disk_cache/blockfile/mapped_file.h
similarity index 89%
rename from net/disk_cache/mapped_file.h
rename to net/disk_cache/blockfile/mapped_file.h
index ba7f4adae65f8b4967aa74abad3c02cd20ff0f87..8a1e40fa6ce961e46e63a7badbb901c64ad3b556 100644
--- a/net/disk_cache/mapped_file.h
+++ b/net/disk_cache/blockfile/mapped_file.h
@@ -4,12 +4,12 @@
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
-#ifndef NET_DISK_CACHE_MAPPED_FILE_H_
-#define NET_DISK_CACHE_MAPPED_FILE_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_
+#define NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_
 
 #include "net/base/net_export.h"
-#include "net/disk_cache/file.h"
-#include "net/disk_cache/file_block.h"
+#include "net/disk_cache/blockfile/file.h"
+#include "net/disk_cache/blockfile/file_block.h"
 
 namespace base {
 class FilePath;
@@ -75,4 +75,4 @@ class ScopedFlush {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_MAPPED_FILE_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_