Drive: fix the DCHECK condition on stopping update watch.

BUG=none
R=hshi@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10830076

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149366 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/extensions/file_browser_event_router.cc

@@ -238,7 +238,7 @@ void FileBrowserEventRouter::HandleRemoteUpdateRequestOnUIThread(bool start) {
       file_system->StartUpdates();
     ++num_remote_update_requests_;
   } else {
-    DCHECK_LE(0, num_remote_update_requests_);
+    DCHECK_LE(1, num_remote_update_requests_);
     --num_remote_update_requests_;
     if (num_remote_update_requests_ == 0)
       file_system->StopUpdates();