Create a simple service in Automator: "Open URL in Google Chrome"

Hi folks

I use Safari as my default browser but some URLs I receive in Mail.app must be opened in Chrome.

I'd like to make a simple service that allows me to right-click on a URL in a message and say "Open URL in Google Chrome". I'd like to do it using a shell script because it would be fractionally faster than using AppleScript.

1. I've opened Automator, created a new Service and added one action: "Run Shell Script".
2. Options:
   1. Service receives selected URLs
   2. Input is Entire selection
   3. Pass input as arguments
3. Script (one simple line): "open "$1" -a /Applications/Google\ Chrome.app"

The Service appears in the System Preferences shortcuts list under 'Internet' but does not show up in the Mail.app Services contextual menu. Can you spot what I might be forgetting or doing wrong?

Thanks so much!

PS Posting to developer forums because I can't find an 'Automator' forum any more