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

net/filter/gzip_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 <fstream>
 #include <ostream>
 
+#include "base/bit_cast.h"
 #include "base/files/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "net/base/io_buffer.h"
 #include "net/filter/gzip_filter.h"
 #include "net/filter/mock_filter_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "third_party/zlib/zlib.h"
 
@@ skipping 360 matching lines @@
   int corrupt_decode_size = kDefaultBufferSize;
 
   int code = DecodeAllWithFilter(filter_.get(), corrupt_data, corrupt_data_len,
                                  corrupt_decode_buffer, &corrupt_decode_size);
 
   // Expect failures
   EXPECT_TRUE(code == Filter::FILTER_ERROR);
 }
 
 }  // namespace net