Update from https://crrev.com/327068

base/i18n/icu_util.h

 // Copyright (c) 2011 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 BASE_I18N_ICU_UTIL_H_
 #define BASE_I18N_ICU_UTIL_H_
 
 #include "base/files/memory_mapped_file.h"
 #include "base/i18n/base_i18n_export.h"
 #include "build/build_config.h"
 
 namespace base {
 namespace i18n {
 
 BASE_I18N_EXPORT extern const char kIcuDataFileName[];
 
+#if !defined(OS_NACL)
 // Call this function to load ICU's data tables for the current process.  This
 // function should be called before ICU is used.
 BASE_I18N_EXPORT bool InitializeICU();
+#endif
 
 #if defined(OS_ANDROID)
 // Android uses a file descriptor passed by browser process to initialize ICU
 // in render processes.
 BASE_I18N_EXPORT bool InitializeICUWithFileDescriptor(
     int data_fd,
     base::MemoryMappedFile::Region data_region);
 #endif
 
 // In a test binary, the call above might occur twice.
 BASE_I18N_EXPORT void AllowMultipleInitializeCallsForTesting();
 
 }  // namespace i18n
 }  // namespace base
 
 #endif  // BASE_I18N_ICU_UTIL_H_