Pretty simple bass. Just play these beats the entire song.

G|----------------------------------------------------------------|
D|----7-------7-------7-------7-------7-------7-------7-------7---|
A|----------------------------------------------------------------|
E|5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-|

G|----------------------------------------------------------------|
D|----7-------7-------7-------7-------7-------7-------7-------7---|
A|5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-5-5---5-|
E|----------------------------------------------------------------|

Enjoy!