Revert "Workaround for presimplify bug in Chrome."

This bug was fixed and rolled out in V8 versions 3.27.34.17 and
3.28.71.7, hence the fix has been in Chrome Stable for some time now
(for all target systems).

More details:

  https://code.google.com/p/v8/issues/detail?id=3529

This reverts commit f66aa3e9e71ab310177b608fc4fe7722c06271a2.

Conflicts:
	topojson.js