Unimport two iframe tests.

* cross_origin_parentage.html needs an HTTP server.
* same_origin_parentage.html needs an extra HTML resource.

TBR=rbyers@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2102943002
Cr-Commit-Position: refs/heads/master@{#402361}
5 files changed