clang/win: Fix most -Wunused-function warnings in Chromium code.

net/disk_cache/simple/simple_util.cc

 // Copyright (c) 2013 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/simple/simple_util.h"
 
 #include <limits>
 
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
 
 namespace {
 
 // Size of the uint64 hash_key number in Hex format in a string.
 const size_t kEntryHashKeyAsHexStringSize = 2 * sizeof(uint64);
 
+#if defined(OS_POSIX)
 // TODO(clamy, gavinp): this should go in base
 bool GetNanoSecsFromStat(const struct stat& st,
                          time_t* out_sec,
                          long* out_nsec) {
 #if defined(OS_ANDROID)
   *out_sec = st.st_mtime;
   *out_nsec = st.st_mtime_nsec;
   return true;
 #elif defined(OS_LINUX)
   *out_sec = st.st_mtim.tv_sec;
   *out_nsec = st.st_mtim.tv_nsec;
   return true;
 #elif defined(OS_MACOSX) || defined(OS_IOS) || defined(OS_BSD)
   *out_sec = st.st_mtimespec.tv_sec;
   *out_nsec = st.st_mtimespec.tv_nsec;
   return true;
 #else
   return false;
 #endif
 }
+#endif  // defined(OS_POSIX)
 
 }  // namespace
 
 namespace disk_cache {
 
 namespace simple_util {
 
 std::string ConvertEntryHashKeyToHexString(uint64 hash_key) {
   const std::string hash_key_str = base::StringPrintf("%016" PRIx64, hash_key);
   DCHECK_EQ(kEntryHashKeyAsHexStringSize, hash_key_str.size());
@@ skipping 75 matching lines @@
   base::File::Info file_info;
   if (!base::GetFileInfo(path, &file_info))
     return false;
   *out_mtime = file_info.last_modified;
   return true;
 }
 
 }  // namespace simple_backend
 
 }  // namespace disk_cache