It hasn’t been open sourced, right?
Chromium also has its code indexed by the older version of this tool: https://cs.chromium.org/
Chromium recently switched over to a new version of code search.
Compare that to the redesign where each xref jump has me staring at a spinner for half a second, the xref bar has no visual separation between type, filename, and code snippet, all buttons visually indistinguishable with a blue on white color scheme, the "layers" dropdown is replaced with a mishmash of buttons scattered across the layout, etc.
I really hope they're not forcing this abhorrent redesign on their developers as well.