How do I view emoji in Google Chrome in Lion?
This isn't exactly what you're looking for, but it should actually work, which is an advantage.

Create a service in Automator. The service takes no input.

Two actions.

First action:

Run AppleScript
Here's the script:

on run {input, parameters}
    tell application "Google Chrome" to activate
    tell application "System Events" to tell application process "Google Chrome" to set myvar to value of text field 1 of tool bar 1 of window 1
    if myvar contains "://" then
        -- do nothing
    else
        set myvar to "http://" &amp; myvar
    end if
    return myvar

end run


Second action:

Website Popup

Assign it a keystroke and you're good to go.