UserAgent: Mozilla/5.0 (X11; CrOS x86_64 8530.96.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.154 Safari/537.36
Platform: 8530.96.0 (Official Build) stable-channel link

Steps to reproduce the problem:
1. Log into a remote Unix shell via (eg) SecureShell
2. Run the command: print '\033]0;This goes into the title bar\007' 

What is the expected behavior?
The text 'This goes into the title bar' will appear in the SecureShell title bar.

What went wrong?
The title bar remains blank.

WebStore page: https://chrome.google.com/webstore/detail/secure-shell/pnhechapfaindjhompbnflcldabbghjo

Did this work before? No 

Chrome version: 53.0.2785.154  Channel: stable
OS Version: 8530.96.0
Flash Version: Shockwave Flash 23.0 r0

1) The hterm code correctly calls setWindowTitle() when it receives an OSC 0 ; text BEL sequence.
2) If I start an additional SecureShell session (with Ctrl-Shift-N) then the OSC 0 ; text BEL sequence does work correctly.
3) The problem also exists with Mosh but the above work-around doesn't work with mosh because it doesn't support a "start new Mosh" command within Mosh.