How do I disable two finger swiping back/forward on Mac OS Lion? – Google Groups
Finally, found a fix for this!
In System Preferences > Trackpad, under the “More Gestures” tab, disable “Swipe between pages” (or set it to use 3 fingers instead of 2). Chrome will honor this setting.
http://productforums.google.com/forum/#!topic/chrome/Gckt3nbt_SU