Convert SysInfo::AmountOfFreeDiskSpace from wstring to FilePath.

base/sys_info_posix.cc

 // Copyright (c) 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/sys_info.h"
 
 #include <errno.h>
 #include <string.h>
 #include <sys/statvfs.h>
 #include <sys/utsname.h>
@@ skipping 68 matching lines @@
   if (pages == -1 || page_size == -1) {
     NOTREACHED();
     return 0;
   }
 
   return static_cast<int64>(pages) * page_size;
 #endif
 }
 
 // static
-int64 SysInfo::AmountOfFreeDiskSpace(const std::wstring& path) {
+int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
   struct statvfs stats;
-  if (statvfs(WideToUTF8(path).c_str(), &stats) != 0) {
+  if (statvfs(path.value().c_str(), &stats) != 0) {
     return -1;
   }
   return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
 }
 
 // static
 bool SysInfo::HasEnvVar(const wchar_t* var) {
   std::string var_utf8 = WideToUTF8(std::wstring(var));
   return getenv(var_utf8.c_str()) != NULL;
 }
@@ skipping 114 matching lines @@
     file_util::ReadFileToString(FilePath("/proc/sys/kernel/shmmax"), &contents);
     limit = strtoul(contents.c_str(), NULL, 0);
     limit_valid = true;
   }
 
   return limit;
 }
 #endif
 
 }  // namespace base