How to remove - Is product available for purchase with Google Checkout from layered navigation?

I had never seen this until this project based on Magento ver. 1.6.0.0 or, did I not realised before :)

I tried to turn off google checkout by Disabling module at:

System -> Configuration -> Advanced -> Disable Modules Output -> Mage_GoogleCheckout

But, that didn't help. So checked another location to disable and found another location and turned off all google checkout *:

System -> Configuration -> Google API -> Google Checkout -> Enable

Still it was appearing on layered navigation. So, looked on the final location at:

Catalog -> Attributes -> Manage Attributes -> enable_googlecheckout

Here I set "Use In Search Results Layered Navigation" to NO.

Yohooo! finally it's gone from my layered navigation on the sidebar.