Revert "Reland "Refactor TabHoverCardController to use a generic View.""

This reverts commit 1129114ff6d93e48f1326275f715c31ec4aea4ca.

Reason for revert: It's flaky after the reland

Original change's description:
> Reland "Refactor TabHoverCardController to use a generic View."
>
> This is a reland of commit f8249a1e06673b43d5ffe60a9b96d3bc54b2feea
>
> Original change's description:
> > Refactor TabHoverCardController to use a generic View.
> >
> > Abstract HoverCardController logic so that other views can be used to
> > show hovercards. Main changes include:
> >
> > * Introduce HoverCardDelegate that casts the View and provides data back to the controller
> > * TabHoverCardController now no longer interacts with the view except for checking for equality and observing the tab thumbnail
> > * Change interfaces to use View instead of Tab (e.g. UpdateHoverCard)
> > * Rename 2 HoverCardUpdateTypes to reference View instead of Tab
> >
> > Bug: 439589464
> > Change-Id: I6b13c4ca5a44bfb0617001beb235bdd2af506d5a
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6966297
> > Commit-Queue: Mickey Burks <mickeyburks@chromium.org>
> > Reviewed-by: Darryl James <dljames@chromium.org>
> > Reviewed-by: Eshwar Stalin <estalin@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1518923}
>
> Bug: 439589464
> Change-Id: Idb9bc0ac39858cc0c946963615221d251946f760
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6975271
> Reviewed-by: Eshwar Stalin <estalin@chromium.org>
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Commit-Queue: Mickey Burks <mickeyburks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1520090}

Bug: 439589464
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I855e21c94cdc22ce0c4baaa447c93a16179dd944
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6981302
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Mingyu Lei <leimy@chromium.org>
Auto-Submit: Mingyu Lei <leimy@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1520379}