Comment by surajrmal

I wouldn't say most. Google is known for constantly iterating on its code internally to the point of not getting anything done other than code churn. While there is use of raw pointers, I'd argue it's idiomatic to still use raw pointers in c++ for non owning references that are well scoped. Using shared pointers everywhere can be overkill. That doesn't mean the codebase is pre c++11 in style.

Rewriting a codebase in another language that has no good interop is rarely a good idea. The need to replicate multiple versions of each internal library can become incredibly taxing. Migrations need to be low risk at Google scale and if you can't do it piecewise it's often not worth attempting either. Also worth noting that java is just as prevelant if not moreso in core products.