define OS_BSD on *BSD and replace the ifdefs to use that

base/file_util_posix.cc

 // 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.
 
 #include "base/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 36 matching lines @@
 #include "base/utf_string_conversions.h"
 
 #if defined(OS_ANDROID)
 #include "base/os_compat_android.h"
 #endif
 
 namespace file_util {
 
 namespace {
 
-#if defined(OS_OPENBSD) || defined(OS_FREEBSD) || \
-    (defined(OS_MACOSX) && \
-     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
+#if defined(OS_BSD) || (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) {
   base::ThreadRestrictions::AssertIOAllowed();
   return stat(path, sb);
 }
 static int CallLstat(const char *path, stat_wrapper_t *sb) {
   base::ThreadRestrictions::AssertIOAllowed();
   return lstat(path, sb);
 }
 #else
@@ skipping 81 matching lines @@
   return true;
 }
 
 int CountFilesCreatedAfter(const FilePath& path,
                            const base::Time& comparison_time) {
   base::ThreadRestrictions::AssertIOAllowed();
   int file_count = 0;
 
   DIR* dir = opendir(path.value().c_str());
   if (dir) {
-#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_FREEBSD) && \
-    !defined(OS_OPENBSD) && !defined(OS_SOLARIS) && !defined(OS_ANDROID)
+#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_BSD) && \
+    !defined(OS_SOLARIS) && !defined(OS_ANDROID)
   #error Port warning: depending on the definition of struct dirent, \
          additional space for pathname may be needed
 #endif
     struct dirent ent_buf;
     struct dirent* ent;
     while (readdir_r(dir, &ent_buf, &ent) == 0 && ent) {
       if ((strcmp(ent->d_name, ".") == 0) ||
           (strcmp(ent->d_name, "..") == 0))
         continue;
 
@@ skipping 621 matching lines @@
   return base::Time::FromTimeT(find_info.stat.st_mtime);
 }
 
 bool FileEnumerator::ReadDirectory(std::vector<DirectoryEntryInfo>* entries,
                                    const FilePath& source, bool show_links) {
   base::ThreadRestrictions::AssertIOAllowed();
   DIR* dir = opendir(source.value().c_str());
   if (!dir)
     return false;
 
-#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_FREEBSD) && \
-    !defined(OS_OPENBSD) && !defined(OS_SOLARIS) && !defined(OS_ANDROID)
+#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_BSD) && \
+    !defined(OS_SOLARIS) && !defined(OS_ANDROID)
   #error Port warning: depending on the definition of struct dirent, \
          additional space for pathname may be needed
 #endif
 
   struct dirent dent_buf;
   struct dirent* dent;
   while (readdir_r(dir, &dent_buf, &dent) == 0 && dent) {
     DirectoryEntryInfo info;
     info.filename = FilePath(dent->d_name);
 
@@ skipping 241 matching lines @@
 
     allowed_group_ids.insert(group_record->gr_gid);
   }
 
   return VerifyPathControlledByUser(
       kFileSystemRoot, path, kRootUid, allowed_group_ids);
 }
 #endif  // defined(OS_MACOSX)
 
 }  // namespace file_util