Replace QuicheStrCat with base::StrCat outside of QUICHE

Change-Id: If3ed612970f6d576a30fd4a0cf783e7715d6d59f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521939


Reviewed-by: David Schinazi <dschinazi@chromium.org>
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824928}