Move bit_cast from base/macros.h to its own header

net/disk_cache/blockfile/index_table_v3.cc

 // Copyright 2014 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.
 
 #include "net/disk_cache/blockfile/index_table_v3.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
 
+#include "base/bit_cast.h"
 #include "base/bits.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/disk_cache.h"
 
 using base::Time;
 using base::TimeDelta;
 using disk_cache::CellInfo;
 using disk_cache::CellList;
 using disk_cache::IndexCell;
@@ skipping 1118 matching lines @@
 bool IndexTable::MisplacedHash(const IndexCell& cell, uint32_t hash) {
   if (!extra_bits_)
     return false;
 
   uint32_t mask = (1 << extra_bits_) - 1;
   hash = small_table_ ? hash >> kSmallTableHashShift : hash >> kHashShift;
   return (GetHashValue(cell) & mask) != (hash & mask);
 }
 
 }  // namespace disk_cache