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

chrome/browser/system_monitor/media_device_notifications_window_win.cc

Index: chrome/browser/system_monitor/media_device_notifications_window_win.cc
diff --git a/chrome/browser/system_monitor/media_device_notifications_window_win.cc b/chrome/browser/system_monitor/media_device_notifications_window_win.cc
index 01136cd45e753ce0ad9d2d1c6970cd7b2fc7fdf7..76879fe9e87d7ea9ee5e82f481ad5627b82a71b4 100644
--- a/chrome/browser/system_monitor/media_device_notifications_window_win.cc
+++ b/chrome/browser/system_monitor/media_device_notifications_window_win.cc
@@ -159,6 +159,17 @@ void MediaDeviceNotificationsWindowWin::ProcessMediaDeviceAttachedOnUIThread(
                                                         path.value());
 }
 
+bool MediaDeviceNotificationsWindowWin::StartWatchingStorage(
+    const FilePath::StringType& path) {
+  return false;
+}
+
+bool MediaDeviceNotificationsWindowWin::StopWatchingStorage(
+    const FilePath::StringType& path) {
+  return false;
+}
+
+
 LRESULT CALLBACK MediaDeviceNotificationsWindowWin::WndProc(
     HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
   switch (message) {