[M145] Fix crash on TabModel.GetBrowserWindowInterface

Original change's description:
> Fix crash on TabModel.GetBrowserWindowInterface
> 
> Fix a CHECK failure on dev build where
> TabModel::GetBrowserWindowInterface() is called after a tab is detached
> from a browser window and before attach to another browser window.
> Instead of crashing the browser TabModel::GetBrowserWindowInterface()
> should return nullptr in this case.
> 
> Bug: 475155069
> Change-Id: I5d0329bfd0c3e025cbe5dc43610fae40880d76da
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7458200
> Reviewed-by: David Pennington <dpenning@chromium.org>
> Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1568448}

(cherry picked from commit eca4e1d660be014516f65297bebc2c657dd8b944)

Bug: 476126281,475155069
Change-Id: I5d0329bfd0c3e025cbe5dc43610fae40880d76da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7487011
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Yuheng Huang <yuhengh@chromium.org>
Auto-Submit: Chrome Cherry Picker <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7632@{#155}
Cr-Branched-From: 0bbdf2913883391365383b0a5dfe7bf9fd1a5213-refs/heads/main@{#1568190}