Revert "tour: Enable tour navigation in IE10, IE11, and Edge"

This is totally broken on non-IE browsers.

This reverts commit 83cfec22ac98390b1d89bc8c58f755bd45a989d4.

Change-Id: I4051c11aa80f6adfd6ec60255d0b04de93b5fb9a
Reviewed-on: https://go-review.googlesource.com/14810
Reviewed-by: Andrew Gerrand <adg@golang.org>
2 files changed