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This change includes special handlers for ArcPolicy,
NativePrintersBulkConfiguration, DeviceNativePrinters,
External​Print​Servers policies and "Dictionary" data type policies for
extensions.
Now it's allowed to use commas after last objects in JSON lists and
dictionaries.

Bug: 843988
Change-Id: I3ced2d1cfb3e009287b95ee07ccc47595ae29edf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041618Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Bartosz Fabianowski <bartfab@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740251}