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Originally, we cancel intent in window unload listener when closing CCA.
However, the the callback of the cancel() method is triggered, the
connection between CCA and Chrome might already be tore down.

This CL moves the logic to Chrome for SWA version. For platform app
version, it still cancels the intent in background page.

Bug: b/172337144
Test: tast run [DUT] camera.CCAUIIntent.swa

Change-Id: I8362242ad4990aeda947061f756bf35ecf8bf736
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573261
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834602}