I'm not sure why this is a problem. I've been using Chrome a lot since day 1 of the original beta and I've never had the zoom level change by moving the mouse. I actually had to look it up to see how to do it with the mouse, since I always use the keyboard.
There isn't a switch to disable the zoom function, however there a number of extensions for zoom including one called Zoom Lock.
I've had this happen a few times on my desktop PC. I'm not sure of the exact sequence - especially since I can't repeat the problem at will - but it appears to happen when I click on a website icon in "Other bookmarks" or on the bookmarks menu bar and then, almost immediately afterwards, rapidly scroll using the scroll wheel on my mouse.
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