Revert "[DevTools] Propagate keyboard shortcuts in native menus."

This reverts commit 2639e68b.

Reason for revert: We shall not (mis)use the minor text for shortcuts.

Original change's description:
> [DevTools] Propagate keyboard shortcuts in native menus.
>
> The DevTools front-end already passes a `shortcut` field as part of the
> `ShowContextMenuItem`, but the Chromium back-end never paid attention to
> this field until now. With this change, we thread through the shortcut
> all the way to the `RenderViewContextMenuBase` and put it as the minor
> text for menu items.
>
> Screenshot: https://i.imgur.com/8mFJsWM.png
> Doc: https://goo.gle/devtools-consistent-context-menus
> Change-Id: I4ce3b13f8c2445c6b658c3445af68344fde6a64d
> Bug: 330213829
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5489020


> Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Danil Somsikov <dsv@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1304296}

Bug: 330213829
Change-Id: I6e00b3c9e67248579d8bab5ecbe6308ba5773689
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5605364


Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Danil Somsikov <dsv@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312631}