Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/entry_impl.cc

Index: net/disk_cache/blockfile/entry_impl.cc
diff --git a/net/disk_cache/entry_impl.cc b/net/disk_cache/blockfile/entry_impl.cc
similarity index 99%
rename from net/disk_cache/entry_impl.cc
rename to net/disk_cache/blockfile/entry_impl.cc
index d6796d70073675ac7344908ead0a009fdd78ba91..2f39e58ac7fd7f909b1ccee8950a2fbae45aaa7c 100644
--- a/net/disk_cache/entry_impl.cc
+++ b/net/disk_cache/blockfile/entry_impl.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/entry_impl.h"
+#include "net/disk_cache/blockfile/entry_impl.h"
 
 #include "base/hash.h"
 #include "base/message_loop/message_loop.h"
@@ -10,13 +10,13 @@
 #include "base/strings/string_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
-#include "net/disk_cache/backend_impl.h"
-#include "net/disk_cache/bitmap.h"
+#include "net/disk_cache/blockfile/backend_impl.h"
+#include "net/disk_cache/blockfile/bitmap.h"
+#include "net/disk_cache/blockfile/disk_format.h"
+#include "net/disk_cache/blockfile/histogram_macros.h"
+#include "net/disk_cache/blockfile/sparse_control.h"
 #include "net/disk_cache/cache_util.h"
-#include "net/disk_cache/disk_format.h"
-#include "net/disk_cache/histogram_macros.h"
 #include "net/disk_cache/net_log_parameters.h"
-#include "net/disk_cache/sparse_control.h"
 
 // Provide a BackendImpl object to macros from histogram_macros.h.
 #define CACHE_UMA_BACKEND_IMPL_OBJ backend_