Extend the capability of SystemMonitor to support watching storage free space change

chrome/browser/system_monitor/removable_device_notifications_window_win.cc

Index: chrome/browser/system_monitor/removable_device_notifications_window_win.cc
diff --git a/chrome/browser/system_monitor/removable_device_notifications_window_win.cc b/chrome/browser/system_monitor/removable_device_notifications_window_win.cc
index 6cd090ee10bad44abc75bd13b7a9817118e7d6f1..cf7ea87ee4045affda8d9636d10ad73eb814713a 100644
--- a/chrome/browser/system_monitor/removable_device_notifications_window_win.cc
+++ b/chrome/browser/system_monitor/removable_device_notifications_window_win.cc
@@ -161,6 +161,16 @@ RemovableDeviceNotificationsWindowWin::ProcessRemovableDeviceAttachedOnUIThread(
                                                         path.value());
 }
 
+void RemovableDeviceNotificationsWindowWin::StartWatchingStorage(
+    const FilePath& path) {
+  NOTIMPLEMENTED();
+}
+
+void RemovableDeviceNotificationsWindowWin::StopWatchingStorage(
+    const FilePath& path) {
+  NOTIMPLEMENTED();
+}
+
 LRESULT CALLBACK RemovableDeviceNotificationsWindowWin::WndProc(
     HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
   switch (message) {