Remove most PlzNavigate mentions in chrome/

This CL removes most of the references to PlzNavigate in the comments of
chrome/. Some problematic cases where further expertise is needed are
left out, but this covers more than 90% of the references.

Change-Id: Ibc3876e07bf9bf8eef0838757ae1db4a77d38eec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729161
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682781}
16 files changed