Vulcanize incorrectly rewrites relative paths

[justinfagnani]

Report from customer, needs reproduction:

If I write:

<iframe src="../foo.html">

in a Polymer component that's vulcanized by polymer_binary, the resulting HTML contains this:

<iframe src="/foo.html">

[garlicnation]

I believe this only happens when vulcanize is invoked with --abspath

[stale[bot]]

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