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

chrome/browser/storage_monitor/volume_mount_watcher_win.cc

 // 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/volume_mount_watcher_win.h"
 
 #include <windows.h>
 
 #include <dbt.h>
 #include <fileapi.h>
@@ skipping 516 matching lines @@
   }
   if (device_metadata_.erase(device.value()) == 0) {
     callback.Run(StorageMonitor::EJECT_FAILURE);
     return;
   }
 
   task_runner_->PostTask(FROM_HERE,
       base::Bind(&EjectDeviceInThreadPool, device, callback, task_runner_, 0));
 }
 
+std::vector<StorageInfo> VolumeMountWatcherWin::GetAllVolumeStorages() const {
+  std::vector<StorageInfo> results;
+  MountPointDeviceMetadataMap::const_iterator it;
+  for (it = device_metadata_.begin(); it != device_metadata_.end(); ++it)
+    results.push_back(it->second);
+  return results;
+}
+
 }  // namespace chrome