protz/GMail-Conversation-View — pull request #569 by shirosaki (2012-02-14 03:17:10+00:00)
Title: Hide vertical scrollbar in messages.

Some messages have meaningless vertical scroll bar when showing quoted text.
Here is a example on Windows XP with Thunderbird 11.0.
http://i.imgur.com/gJzsC.png

`iframe.style.height` seems 1 px shorter. This patch is workaround to hide scroll bar.