tree 9ab39163485e18dd950dbb610be74e3b8fbf0075
parent d8a0798b5af53d6ea27c70ec6fd4a474443c8870
author Goktug Gokdogan <goktug@google.com> 1437604762 -0700
committer Goktug Gokdogan <goktug@google.com> 1437615285 -0700

Improve Map feature check.

This helps us to avoid hitting legacy Map implementations
that use different iteration protocol (i.e. Firefox 24).

Change-Id: Ie6542e4c6fba4bb23fc63c7a9bcf4f256bce73b5