* Inline a lot of constants into their lone use and simplify where
possible
* `a + b` is simple and fast when concatenating a string with a single
other string-like. Otherwise, `StrCat()` is generally faster and more
readable than `StringPrintf()`.
* More readable error when there's no auth error message
* Don't log two warnings when the auth error is unknown; we already
logged what the error was
Bug: none
Change-Id: Ie60acaa113704be4b7ada2ed1057d44f94d2bb90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6033038
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Ryan Sultanem <rsult@google.com>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Ryan Sultanem <rsult@google.com>
Cr-Commit-Position: refs/heads/main@{#1385626}
b6cb9c2a31