Or you can enable emacs keybinding in all gtk-2 apps
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Add following line in .gtkrc-2.0
gtk-key-theme-name = "Emacs"
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And run following command
$ gconftool -t string --set /desktop/gnome/interface/gtk_key_theme Emacs
To restore, just remove that line in .gtkrc-2.0 and run
$ gconftool -t string --set /desktop/gnome/interface/gtk_key_theme Default
Do use chromium, I have tried google chrome dev chanel, it still does not obey your gtk keybinding configuration.