hashchange: Remove unused function.
hashchange: Remove unused function.

We are using sethash for the same purpose now.

kou/zulip,andersk/zulip,zulip/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,rht/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,kou/zulip