Now that we like using std::make_unique (or base::MakeUnique) everywhere, code search seems unable to find constructors called via a std::make_unique instantiation.

Steps to reproduce:
1. Go to https://cs.chromium.org/chromium/src/chrome/browser/ui/omnibox/chrome_omnibox_navigation_observer.h?type=cs&q=ChromeOmniboxNavigationObserver&l=58
2. Click the constructor.
3. Skim through references.

A bunch of constructor calls in tests show up, and src/buildtools/third_party/libc++/trunk/include/memory, which is std::make_unique, but it does not look for callers for that particular std::make_unique instantiation, notably this one:

https://cs.chromium.org/chromium/src/chrome/browser/ui/omnibox/chrome_omnibox_client.cc?rcl=5a7ad6df8624441a683d1be0e508f73e89914d8a&l=129

I feel like this used to work? Was there some change in backend recently? Or am I just making this up?