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TBR=dcheng@chromium.org,jamescook@chromium.org,msw@chromium.org,xiaohuic@chromium.org

Original change's description:
> assistant: filter out incognito windows in assistant screenshot.
>
> Per privacy requirement, incognito windows should not be included
> in screenshot sent to assistant server.
>
> Bug: b/78193324
> Test:
>   ash_unittests --gtest_filter=AssistantControllerTest.Screenshot
>   browser_tests --gtest_filter=BrowserNonClientFrameViewAshTest.IncognitoMarkedAsAssistantBlocked*
>
> Change-Id: Idf55135959721d69414a1ec6fae396f9763ebe49
> Reviewed-on: https://chromium-review.googlesource.com/1114293
> Commit-Queue: Muyuan Li <muyuanli@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Michael Wasserman <msw@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#571385}

Change-Id: Ieecafffe5f1e14971b3c07dc799323a29885de16
Reviewed-on: https://chromium-review.googlesource.com/1119766Reviewed-by: Muyuan Li <muyuanli@chromium.org>
Commit-Queue: Muyuan Li <muyuanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571407}