I can only say WHY it does not work, but it can help you look for another way to solve your problem.
from chrome version 28.0.1500.11 chrome does not support -webkit-text-size-adjust anymore. (changelist here: http://trac.webkit.org/changeset/145168 ). and the safari follows him. on newer versions of mac os text-size-adjust is already gone.
I also have problems with this, since I created a whole site on rem modules to make it not only responsive, but also completely flexible. it worked fine, but suddenly everything is huge now. I work a lot on a solution for this, but if anyone has an idea, I donβt think I would really appreciate it.
as soon as I find a solution, I will be back so you know.
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