Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/eviction.h

Index: net/disk_cache/blockfile/eviction.h
diff --git a/net/disk_cache/eviction.h b/net/disk_cache/blockfile/eviction.h
similarity index 93%
rename from net/disk_cache/eviction.h
rename to net/disk_cache/blockfile/eviction.h
index f6224a936fdae8e4392efac1f8d9b8890c075072..e49883bac2e1eef54fc52d87a96aa8eaa1a24a28 100644
--- a/net/disk_cache/eviction.h
+++ b/net/disk_cache/blockfile/eviction.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_DISK_CACHE_EVICTION_H_
-#define NET_DISK_CACHE_EVICTION_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
+#define NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
-#include "net/disk_cache/rankings.h"
+#include "net/disk_cache/blockfile/rankings.h"
 
 namespace disk_cache {
 
@@ -88,4 +88,4 @@ class Eviction {
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_EVICTION_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_EVICTION_H_