GitLab

Change Grit's default behavior to gzip compress all such
files, unless compress="false" is explicitly specified.

In other words, compress="gzip" is now the default behavior, and
same as not specifying a |compress| attribute.

out/<out_folder>/resources.pak sizes before/after
(with optimize_webui=true)

Linux: 7.1MB ->  5.9MB,  -4.9%
CrOS: 21.0MB -> 18.0MB, -14.3%

Bug: 1068407
Change-Id: I3fa63a4db6087b2f3502cbb8b76a6ca3b576e7fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612333
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761031}