Move GetFreeDiskSpace to SysInfo.

net/disk_cache/cache_util_posix.cc

Index: net/disk_cache/cache_util_posix.cc
===================================================================
--- net/disk_cache/cache_util_posix.cc	(revision 2357)
+++ net/disk_cache/cache_util_posix.cc	(working copy)
@@ -4,29 +4,12 @@
 
 #include "net/disk_cache/cache_util.h"
 
-#include <errno.h>
-#include <sys/statvfs.h>
-#include <unistd.h>
-
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 
-#if defined(OS_MACOSX)
-#include <mach/mach_host.h>
-#include <mach/mach_init.h>
-#endif
-
 namespace disk_cache {
 
-int64 GetFreeDiskSpace(const std::wstring& path) {
-  struct statvfs stats;
-  if (statvfs(WideToUTF8(path).c_str(), &stats) != 0) {
-    return -1;
-  }
-  return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
-}
-
 bool MoveCache(const std::wstring& from_path, const std::wstring& to_path) {
   // Just use the version from base.
   return file_util::Move(from_path.c_str(), to_path.c_str());