Unwanted Horizontal & Vertical lines appearing on embedded Google Map API 3 - Chrome

Question

I'm using the WP Google Maps Pro plugin on my Wordpress site to display various maps (API 3):

http://www.escalamadrid.com/roca-real/

In chrome for OS X, I'm getting a 1px horizontal white line when displaying the map:

This only seems to affect Google Chrome. I've tested in Safari and Firefox and the problem does not occur. I've attempted disabling some chrome extensions but to no avail.

Answer 1

Issue no longer occurs in Chrome Version 37.0