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This reverts commit f3dce521.

Reason for revert: We have no urgent need for this feature so removing
it in favour of introducing a caller (vs system) controlled API.

Original change's description:
> [fuchsia] Allow system config to request Android-ish user agent OS.
>
> 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}

Bug: b/171582703
Bug: 1010256
Change-Id: If513affc89195fb78eafb1e9160e583b41708f38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574976
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834031}