Add Linux support for FF5 (Gecko 5.0) in the xpcom plugin.

Mac and Windows to follow as independent changes shortly after.

Review at http://gwt-code-reviews.appspot.com/1466805


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10387 8db76d5a-ed1c-0410-87a9-c151d255dfc7
18 files changed