Chrome regression: in-page Chrome search no longer works for most queries

Created by: slimsag

When searching using browser's built in page search, it is now broken if your search query includes a dash -, parentheses ( or ), period ., or any other token-separating characters.

I believe this is a regression since the last released version of Sourcegraph, as I use this regularly in my workflow and would've noticed if it was a regression longer ago.

Reproduce:

1. Go here: https://sourcegraph.com/github.com/jaegertracing/jaeger/-/blob/plugin/storage/cassandra/schema/docker.sh
2. Cmd+f (or ctrl+f on Windows).
3. Type jaeger-cassandra, notice it turns up no results.

• Another example (search for errors.New): https://sourcegraph.com/github.com/gorilla/mux/-/blob/mux.go
• Another example (search for []*Route): https://sourcegraph.com/github.com/gorilla/mux/-/blob/mux.go (this one behaves very strangely, sometimes finding one result but not finding secondary ones)