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We can cause frame a detach event in a onclose handler (as in the added
layout test), and that led to an inconsistent state. This change fixes
the issue.

Bug: 788890
Change-Id: I229336d89f7c9863f7d8a9770e5410ab76dc3dc9
Reviewed-on: https://chromium-review.googlesource.com/805594Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521629}