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

storage/browser/quota/quota_manager.h

Index: storage/browser/quota/quota_manager.h
diff --git a/storage/browser/quota/quota_manager.h b/storage/browser/quota/quota_manager.h
index a1ef11d2a55fbdeb64aa37463f469d6fa92ef775..2d327241e22c1dc44071f6ba31c402e75e2557eb 100644
--- a/storage/browser/quota/quota_manager.h
+++ b/storage/browser/quota/quota_manager.h
@@ -97,7 +97,7 @@ class STORAGE_EXPORT QuotaEvictionHandler {
   using UsageAndQuotaCallback = base::Callback<
       void(QuotaStatusCode status, const UsageAndQuota& usage_and_quota)>;
   using VolumeInfoCallback = base::Callback<
-      void(bool success, uint64_t available_space, uint64_t total_space)>;
+      void(bool success, int64_t available_space, int64_t total_space)>;
 
   // Returns next origin to evict.  It might return an empty GURL when there are
   // no evictable origins.
@@ -321,7 +321,7 @@ class STORAGE_EXPORT QuotaManager
   // Function pointer type used to store the function which returns
   // information about the volume containing the given FilePath.
   using GetVolumeInfoFn = bool(*)(const base::FilePath&,
-                                  uint64_t* available, uint64_t* total);
+                                  int64_t* available, int64_t* total);
 
   typedef base::Callback<void(const QuotaTableEntries&)>
       DumpQuotaTableCallback;
@@ -419,7 +419,7 @@ class STORAGE_EXPORT QuotaManager
 
   void DidGetVolumeInfo(
       const VolumeInfoCallback& callback,
-      uint64_t* available_space, uint64_t* total_space, bool success);
+      int64_t* available_space, int64_t* total_space, bool success);
 
   void GetLRUOrigin(StorageType type, const GetOriginCallback& callback);
 
@@ -455,9 +455,6 @@ class STORAGE_EXPORT QuotaManager
   static int64_t CallGetAmountOfFreeDiskSpace(
       GetVolumeInfoFn get_vol_info_fn,
       const base::FilePath& profile_path);
-  static bool GetVolumeInfo(const base::FilePath& path,
-                            uint64_t* available_space,
-                            uint64_t* total_size);
 
   const bool is_incognito_;
   const base::FilePath profile_path_;