misc/chrome/gophertool: fix manifest according to http://code.google.com/chrome/extensions/browserAction.html, it should use "default_popup" instead of "popup".
misc/chrome/gophertool: fix manifest
according to http://code.google.com/chrome/extensions/browserAction.html,
it should use "default_popup" instead of "popup".

R=golang-dev, adg
CC=golang-dev
http://codereview.appspot.com/6349077

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang