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CrOS WebUI: gzip Chrome OS resources

This adds compress="gzip" to:
* App Management in OS Settings
* Crostini installer
* Mobile setup page
* Guest session tab
* SMB share dialog
* Debugging UI: chrome://cryptohome, chrome://drive-internals

R=melzhang@google.com,lxj@google.com,khorimoto@chromium.org,baileyberro@chromium.org

Bug: 965089
Change-Id: I37ab9f9773216a8ea2172879f05643bf6c74d5ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874807Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Anand Mistry <amistry@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708641}