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Offline ToS are loaded if attempt to load online content fails.
Play Store ToS are region dependent. The proper version is decided
based on language from chosen locale and device region from the VPD.

Dedicated resources are used for most of the regions targeted by v1
Demo Mode:
  * Belgium: nl-BE, fr-BE
  * Finland: fi-FI
  * Sweden: sv-SE
  * Norway: nb-NO
  * Denmark: da-DK
  * France: fr-FR
  * Ireland: en-IE
  * Netherlands: nl-NL
  * Canada: en-CA, fr-CA
  * US: en-US
  * UK - en-GB
  * Luxembourg: eu (no dedicated terms available for de-LU nor fr-LU)

The other regions use default resources:
  * EMEA: emea
  * EU: eu
  * APAC: apac
  * AMERICAS: en-US
  * Germany: de
  * South Korea: kr
  * Anything else defaults to en-US

Information about VPD regions:
https://storage.googleapis.com/chromeos-factory-docs/sdk/regions.html#available-regions

If Demo Mode expands the list of targeted regions dedicated resources
should be added for the new regions.

Bug: 857275
Test: Run wizard controller and demo setup browser tests.
      Run about_ui_unittest.
      Manually perform offline demo mode setup.

Change-Id: I556f08720f6214f1b33be09af9ac232c103b2f14
Reviewed-on: https://chromium-review.googlesource.com/1211737Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592416}