Extracting NetLog inner classes into their own classes.

net/disk_cache/blockfile/entry_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_
 #define NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
+#include <string>
 
 #include "base/macros.h"
 #include "net/disk_cache/blockfile/disk_format.h"
 #include "net/disk_cache/blockfile/storage_block-inl.h"
 #include "net/disk_cache/blockfile/storage_block.h"
 #include "net/disk_cache/disk_cache.h"
-#include "net/log/net_log.h"
+#include "net/log/net_log_with_source.h"
+
+namespace net {
+class NetLog;
+}
 
 namespace disk_cache {
 
 class BackendImpl;
 class InFlightBackendIO;
 class SparseControl;
 typedef StorageBlock<EntryStore> CacheEntryBlock;
 typedef StorageBlock<RankingsNode> CacheRankingsBlock;
 
 // This class implements the Entry interface. An object of this
@@ skipping 261 matching lines @@
   std::unique_ptr<SparseControl> sparse_;  // Support for sparse entries.
 
   net::NetLogWithSource net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(EntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_