Revert "Add gendered grammar capabilities."

This reverts commit c78570dfdceb9d7bcb7e0542ec8dc8363de86e59.

Reason for revert: This broke glic internal e2e tests. First failed build: http://shortn/_pNV4VEsJht

Original change's description:
> Add gendered grammar capabilities.
>
> This is how we'll determine the user's gender for localization purposes.
>
> PRD:
> https://docs.google.com/document/d/1P9tTdcZ9cQOrD3lMIi-sq5g02GU05NE0YPWFANRiHyE
> DD:
> https://docs.google.com/document/d/1oIuaWzXiRBsZ3qRz9DG6CGFtdk7sP8JeWtjg1-B7yUg
>
> Support for these capabilities has landed on the server side (see
> internal http://cl/785860207 ), but is not live in production yet, hence
> the flags to guard the new values.
>
> The Neuter gender is not yet supported, so it is behind an additional
> flag.
>
> BUG=420947195
>
> Change-Id: I2994843ad58813bd252c09c08ad0753ca56edb4d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6667261
> Reviewed-by: Ted Choc <tedchoc@chromium.org>
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Commit-Queue: Glenn Hartmann <hartmanng@chromium.org>
> Reviewed-by: Tanmoy Mollik <triploblastic@google.com>
> Cr-Commit-Position: refs/heads/main@{#1492060}

Bug: 420947195
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I4a2e7da31051bf4613fb54770a8964b8e6f9495c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6787426
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Auto-Submit: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1492962}