undo CL 5699082 / 6223c9fe432b

We decided not to record installs, for now at least.

««« original CL description
misc/dashboard: record install counts for external packages

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5699082
»»»

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5790044
4 files changed