[SystemInfo API] Rewrite storage info provider using storage monitor impl

chrome/browser/storage_monitor/storage_monitor_mac.mm

 // Copyright (c) 2012 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 "chrome/browser/storage_monitor/storage_monitor_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 292 matching lines @@
   }
 
   EjectDiskOptions* options = new EjectDiskOptions;
   options->bsd_name = bsd_name;
   options->callback = callback;
   options->disk.reset(disk.release());
   content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
                                    base::Bind(EjectDisk, options));
 }
 
+std::vector<StorageInfo> StorageMonitorMac::GetAllAvailableStorages() const {
+  std::vector<StorageInfo> results;
+
+  std::map<std::string, StorageInfo>::const_iterator it;
+  for (it = disk_info_map_.begin(); it != disk_info_map_.end(); ++it)
+    results.push_back(it->second);
+
+  return results;
+}
+
 // static
 void StorageMonitorMac::DiskAppearedCallback(DADiskRef disk, void* context) {
   StorageMonitorMac* monitor = static_cast<StorageMonitorMac*>(context);
   monitor->GetDiskInfoAndUpdate(disk, UPDATE_DEVICE_ADDED);
 }
 
 // static
 void StorageMonitorMac::DiskDisappearedCallback(DADiskRef disk, void* context) {
   StorageMonitorMac* monitor = static_cast<StorageMonitorMac*>(context);
   monitor->GetDiskInfoAndUpdate(disk, UPDATE_DEVICE_REMOVED);
@@ skipping 41 matching lines @@
       it = disk_info_map_.begin(); it != disk_info_map_.end(); ++it) {
     if (it->second.location() == mount_point.value()) {
       *info = it->second;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace chrome