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

net/filter/sdch_filter_unittest.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 <limits.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
+#include "base/bit_cast.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/histogram_tester.h"
 #include "base/test/simple_test_clock.h"
 #include "net/base/io_buffer.h"
 #include "net/base/sdch_dictionary.h"
 #include "net/base/sdch_manager.h"
 #include "net/base/sdch_observer.h"
 #include "net/filter/mock_filter_context.h"
@@ skipping 1270 matching lines @@
 
   filter.reset(nullptr);
 
   // Confirm that we got a "DictionaryUsed" signal from the SdchManager
   // for our dictionary.
   EXPECT_EQ(1, observer.dictionary_used_calls());
   EXPECT_EQ(server_hash, observer.last_server_hash());
 }
 
 }  // namespace net