After combing through the webkit Bugzilla, I found someone who had the same issue and found a workaround.
.face.back {
background-color: #125672;
-moz-transform: rotateY(180deg);
-webkit-transform: rotateY(180deg);
}
Becomes:
.face.back {
background-color: #125672;
-moz-transform: rotateY(180deg);
-webkit-transform: rotateY(180deg) translateZ(1px);
}
The addition of the translateZ to the transform makes the left side of the element clickable.
Here is a link to the bug: https://bugs.webkit.org/show_bug.cgi?id=54371