Convert SysInfo::AmountOfFreeDiskSpace from wstring to FilePath.

net/disk_cache/backend_impl.cc

 // Copyright (c) 2006-2008 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 "net/disk_cache/backend_impl.h"
 
 #include "base/field_trial.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/histogram.h"
@@ skipping 1011 matching lines @@
 // The maximum cache size will be either set explicitly by the caller, or
 // calculated by this code.
 void BackendImpl::AdjustMaxCacheSize(int table_len) {
   if (max_size_)
     return;
 
   // If table_len is provided, the index file exists.
   DCHECK(!table_len || data_->header.magic);
 
   // The user is not setting the size, let's figure it out.
-  int64 available = base::SysInfo::AmountOfFreeDiskSpace(path_.ToWStringHack());
+  int64 available = base::SysInfo::AmountOfFreeDiskSpace(path_);
   if (available < 0) {
     max_size_ = kDefaultCacheSize;
     return;
   }
 
   if (table_len)
     available += data_->header.num_bytes;
 
   max_size_ = PreferedCacheSize(available);
 
@@ skipping 577 matching lines @@
 
   return num_dirty;
 }
 
 bool BackendImpl::CheckEntry(EntryImpl* cache_entry) {
   RankingsNode* rankings = cache_entry->rankings()->Data();
   return !rankings->dummy;
 }
 
 }  // namespace disk_cache