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Allow WebEngine to be configured to report an Android-like UserAgent
via the system-provided config-data, to allow it to be fetch the right
form of content for the device form-factor.

This will likely be replaced with options to configure the Client Hints
reported, on a per-instance basis, once those are standardized.

Bug: b/171582703, 1010256
Change-Id: I9db408be09ec9b9a78facc7b078d635b96c3637b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522071
Commit-Queue: Wez <wez@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825042}