Use MAC_OS_X_DEPLOYMENT_TARGET instead of rolling our own

base/file_util_posix.cc

 // Copyright (c) 2006-2008 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 "base/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
 #include <libgen.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/errno.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 
+#if defined(OS_MACOSX)
+#include <AvailabilityMacros.h>
+#endif
+
 #include <fstream>
 
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
 #include "base/lock.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
 #include "base/singleton.h"
 #include "base/string_util.h"
@@ skipping 45 matching lines @@
   Lock lock_;
   friend struct DefaultSingletonTraits<LocaleAwareComparator>;
 
   DISALLOW_COPY_AND_ASSIGN(LocaleAwareComparator);
 };
 
 }  // namespace
 
 namespace file_util {
 
-#if defined(OS_FREEBSD) || defined(SUPPORT_MACOSX_10_4)
+#if defined(OS_FREEBSD) || \
+    (defined(OS_MACOSX) && \
+     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
 typedef struct stat stat_wrapper_t;
 static int CallStat(const char *path, stat_wrapper_t *sb) {
   return stat(path, sb);
 }
 #else
 typedef struct stat64 stat_wrapper_t;
 static int CallStat(const char *path, stat_wrapper_t *sb) {
   return stat64(path, sb);
 }
 #endif
@@ skipping 641 matching lines @@
     munmap(data_, length_);
   if (file_ != -1)
     close(file_);
 
   data_ = NULL;
   length_ = 0;
   file_ = -1;
 }
 
 } // namespace file_util