Move implementation of QuotaManager.getVolumeInfo to base::SysInfo.

storage/browser/quota/quota_manager.cc

Index: storage/browser/quota/quota_manager.cc
diff --git a/storage/browser/quota/quota_manager.cc b/storage/browser/quota/quota_manager.cc
index ad23d41ec835b534f3dccd2a9d79f377282f810c..79268a61a297bf966605004646d272d27ea637d9 100644
--- a/storage/browser/quota/quota_manager.cc
+++ b/storage/browser/quota/quota_manager.cc
@@ -36,18 +36,6 @@
 #include "storage/browser/quota/usage_tracker.h"
 #include "storage/common/quota/quota_types.h"
 
-// Platform specific includes for GetVolumeInfo().
-#if defined(OS_WIN)
-#include <windows.h>
-#elif defined(OS_POSIX)
-#if defined(OS_ANDROID)
-#include <sys/vfs.h>
-#define statvfs statfs  // Android uses a statvfs-like statfs struct and call.
-#else
-#include <sys/statvfs.h>
-#endif
-#endif
-
 #define UMA_HISTOGRAM_MBYTES(name, sample)          \
   UMA_HISTOGRAM_CUSTOM_COUNTS(                      \
       (name), static_cast<int>((sample) / kMBytes), \
@@ -1860,21 +1848,16 @@ bool QuotaManager::GetVolumeInfo(const base::FilePath& path,
                                  uint64_t* total_size) {
   // Inspired by similar code in the base::SysInfo class.
   base::ThreadRestrictions::AssertIOAllowed();
-#if defined(OS_WIN)
-  ULARGE_INTEGER available, total, free;
-  if (!GetDiskFreeSpaceExW(path.value().c_str(), &available, &total, &free))
+
+  int64_t available = base::SysInfo::AmountOfFreeDiskSpace(path);
+  if (available < 0)
     return false;
-  *available_space = static_cast<uint64_t>(available.QuadPart);
-  *total_size = static_cast<uint64_t>(total.QuadPart);
-#elif defined(OS_POSIX)
-  struct statvfs stats;
-  if (HANDLE_EINTR(statvfs(path.value().c_str(), &stats)) != 0)
+  int64_t total = base::SysInfo::AmountOfTotalDiskSpace(path);
+  if (total < 0)
     return false;
-  *available_space = static_cast<uint64_t>(stats.f_bavail) * stats.f_frsize;
-  *total_size = static_cast<uint64_t>(stats.f_blocks) * stats.f_frsize;
-#else
-#error Not implemented
-#endif
+
+  *available_space = static_cast<uint64_t>(available);
+  *total_size = static_cast<uint64_t>(total);
   return true;
 }