Display extension name on device chooser title
When WebBluetooth is used from chrome-extension page, the chooser title
displays Chrome extension ID. It would be better to display the extension
name if it exists. This CL fixes it.
BUG=
626149
Committed:
https://crrev.com/a29e116d910898c6f783a2d23cba17a20b5c503c
Cr-Commit-Position: refs/heads/master@{#404934}