cmd/go/internal/web: fix log message
cmd/go/internal/web: fix log message

The web package is now used for proxy fetches, so its logs shouldn't
start with "Parsing meta tags".

Change-Id: I22a7dce09e3a681544ee4b860f93c63336e547ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/174740
Run-TryBot: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

nawawi/go,cloudflare/go,golang/go,nawawi/go,nawawi/go,akutz/go,josharian/go,akutz/go,nawawi/go,CAFxX/go,akutz/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,josharian/go,akutz/go,josharian/go,CAFxX/go,josharian/go,CAFxX/go,josharian/go,josharian/go,akutz/go,akutz/go,nawawi/go,josharian/go,cloudflare/go,akutz/go,akutz/go,golang/go,CAFxX/go,cloudflare/go,nawawi/go,golang/go,nawawi/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,golang/go,josharian/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,golang/go,CAFxX/go