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

chrome/browser/storage_monitor/volume_mount_watcher_win.cc

Index: chrome/browser/storage_monitor/volume_mount_watcher_win.cc
diff --git a/chrome/browser/storage_monitor/volume_mount_watcher_win.cc b/chrome/browser/storage_monitor/volume_mount_watcher_win.cc
index fe07c0ac283ad78b5f213d3bc65c0fccdce079f8..612b25cc225af84009fa35fa497743222cebb3cc 100644
--- a/chrome/browser/storage_monitor/volume_mount_watcher_win.cc
+++ b/chrome/browser/storage_monitor/volume_mount_watcher_win.cc
@@ -534,4 +534,12 @@ void VolumeMountWatcherWin::EjectDevice(
       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