GitLab

Pass by constref and only copy up to the first 1000 characters, rather
than copying it all and inserting a nullptr and ellipsis

Also removed the old definition of kMaxUrlLength from media_log.h and
the old truncate method definition

Bug: 1090752
Change-Id: I6665f010937c802b94da9fd344ab3baf6af88a99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299195
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788846}