Use `base::ToString(bool)` where possible in chrome/

This CL rewrites uses of `b ? "true" : "false"` to `base::ToString(b)`
throughout chrome. It doesn't change instances which rely on receiving
a string literal and couldn't obviously be changed to accept a string.

This CL applies the changes in the following directories: chrome/browser/media

This CL was uploaded by an experimental version of git cl split
(https://crbug.com/389069356).

R=mfoltz@chromium.org

Bug: 335797528
Change-Id: I7b07f7dce8fcb47fbae0638f3896ca46e2021878
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6164478
Auto-Submit: Devon Loehr <dloehr@google.com>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Mark Foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1404943}