Fix the timing of updating contextmenu after changing options.

Fix a problem as follows
 
# :ok_hand: :ok_hand: :ok_hand: Expected :ok_hand: :ok_hand: :ok_hand: 

1. I hope to change context menus of CreateLink extension. :smile: 
2. Push "Configure..." button on the extension popup and open a options window.
3. Change "Formats" data.  :blush:
4. Righ click and show context menu on an web pages and select "Copy Link as ..." .
5.  **I can select a item from updated items of CreateLink.** :ok_hand:

# :shit: :shit: :shit: Actual :shit: :shit: :shit: 

1..4. Same.

last 5. I can **NOT SEE** updated items. :frowning: They are old items still. :broken_heart:

# :computer: :computer: :computer: Environments :computer: :computer: :computer:
* Chromium Version 25.0.1364.160 Ubuntu 12.04 (25.0.1364.160-0ubuntu0.12.04.1)