Fix form regression on salesforce.com

This bug appears when an inline script submits a form targeted at an iframe.
Any content after the script doesn't not always appear.

This patch returns us to the pre-r156806 behavior of finding the correct frame for a form submission when scheduling it rather than when firing it. I hope to bring this behavior back when I have more time to diagnose this issue.

BUG=308402

Review URL: https://codereview.chromium.org/66863005

git-svn-id: svn://svn.chromium.org/blink/trunk@161672 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert r161357: phpBB forum post autosizer.

This patch reverts r161357 which autosized forum posts based on an
explicit check for phpBB. In place of this check, we are working on
three parallel efforts to fix this problem:
1) A more general solution to autosizing forum posts
2) A new autosizing implementation more closely matching Gecko
3) Developer outreach.

For more information, see the following blink-dev discussion:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/gX9DE3SAohI

BUG=

Review URL: https://codereview.chromium.org/67253005

git-svn-id: svn://svn.chromium.org/blink/trunk@161673 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r161658

http://src.chromium.org/viewvc/blink?view=revision&revision=161658

TBR=ojan@chromium.org

Review URL: https://codereview.chromium.org/67673002

git-svn-id: svn://svn.chromium.org/blink/trunk@161674 bbb929c8-8fbe-4397-9dbb-9b2b20218538