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This reverts commit 8985ccdc.

Reason for revert: not needed, already plumbed through different path

Original change's description:
> Add CastContentWindow::SetCanGoBackQuery
> 
> This allows querying the CanGoBack status of the underlying app
> 
> Bug: b/145762033
> Test: None
> Change-Id: I330d7124dd7817db69f5ff41bfa58f6059971113
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008066
> Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
> Commit-Queue: Albert Chaulk <achaulk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#733446}

TBR=achaulk@chromium.org,dnicoara@chromium.org,halliwell@chromium.org,seantopping@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/145762033
Change-Id: I668bc87b91d7e70d70c04b995a98d6d756ad5808
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013464Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733739}