HTML parser should not associate elements inside templates with forms

HTML parser should not associate elements inside templates with forms

When parsing <form><template><input>, the previous behavior was to associate
the <input> with the <form>, even though they're not in the same tree (or
even the same document!).

This patch changes that by checking, prior to creating a form control element,
whether the element to be created lives in a document with a browsing context.

BUG=247038
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=152676

[abarth-chromium, 2013-06-14 02:03:32]

LGTM

[adamk, 2013-06-14 16:11:59]

+rafaelw

I'll be out today and Monday, so if someone would like to land this earlier (due
to the urgency of crbug.com/247038) feel free to set the CQ bit

[commit-bot: I haz the power, 2013-06-18 20:45:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/adamk@chromium.org/17033002/4001

[commit-bot: I haz the power, 2013-06-19 00:03:41]

Change committed as 152676