Revert "net/url: fail TestParseErrors test when getting an unwanted error"
Revert "net/url: fail TestParseErrors test when getting an unwanted error"

This reverts https://golang.org/cl/185080.

Reason for revert: some new changes are erroring again, so this broke the builders.

Change-Id: I28da16da98b90cefbb47173d31bbbb56e43062d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/191781
Run-TryBot: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Emmanuel Odeke <277f8eaa8c7dfbc55c17bf5e30561c1a9c45c569@gmail.com>

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