Revert "Base: Delete ostream<< with std::string*"

This reverts commit 4ef5011a7b3b20703c58a1af0589e72b20812026.

Reason for revert: Breaks an internal mocking case that cannot be changed.

Test: m
Change-Id: I83f9338bde02eb2b45b3e52b66ef78490ddbeeda
1 file changed