"Reland" Introduce coordinator to manage ZoomBubbleView lifecycle

This is a reland of commit a8caf1db2225b01147870e86f0b033d3e5f2ebba

- Issue and fix:
A crash was happening during the browser shutdown because the
BrowserWindow was null.

The zoom bubble close is async. Therefore, the BrowserWindow access
should be checked since it can occur during browser shutdown time.

- Original change's description:
A re-entrant call sequence during the creation of the zoom bubble could
lead to a crash. An asynchronous event, such as a focus change,
occurring during the `ShowBubble` method could trigger a call to
`CloseCurrentBubble`. This would nullify the static `zoom_bubble_`
pointer before it was fully initialized, causing a null pointer
dereference on the next line on the instantiation.

The issue has been previously mitigated by checking the `zoom_bubble_`
before accessing it.

This change fixes the crash by introducing `ZoomBubbleCoordinator`, a
new class responsible for managing the lifecycle of `ZoomBubbleView`.
The coordinator is owned by the browser window, providing a clear
ownership model and eliminating the problematic static instance.

By centralizing the creation, showing, and hiding of the bubble within
the coordinator, this refactoring prevents the re-entrancy issue and
ensures the bubble's state is always consistent.

BYPASS_LARGE_CHANGE_WARNING

Change-Id: I0a4a3d992b92ceb2c0e07aadbed429a187d53a46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7017450
Reviewed-by: Dana Fried <dfried@chromium.org>
Commit-Queue: Daniel Soromou <koretadaniel@chromium.org>
Reviewed-by: Eshwar Stalin <estalin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1527033}