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- PlatformAppBrowserTest.PictureInPicture consistently fails with a
  (apparently windows-only) use-after-free on win/asan. That code is new,
  so just revert it (see below), https://crbug.com/873234

- PDFExtensionHitTestTest.MouseLeave flakes fairly often on win/asan, so
  disable the test in that config, https://crbug.com/856169

- SaveType/SavePageOriginalVsSavedComparisonTest.ObjectElementsViaFile/0
  fails fairly consistenly on win/asan (and elsewhere) in
  network_service_browser_tests, so don't enable that suite on the win/asan
  bot just yet (https://crbug.com/840063).

Bug: 869973

Revert "Enable Picture-in-Picture for chrome apps."

This reverts commit e031e566.

Reason for revert: Test has a use-after-free, https://crbug.com/873234

Original change's description:
> Enable Picture-in-Picture for chrome apps.
>
> This CL enables Picture-in-Picture in chrome apps by implementing
> EnterPictureInPicture and ExitPictureInPicture in AppDelegate.
>
> Bug: 863309
> Change-Id: Ib35e83b03373abe864b3a0674ab1e0b341ce291b
> Reviewed-on: https://chromium-review.googlesource.com/1156513
> Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580497}

TBR=beaufort.francois@gmail.com,rdevlin.cronin@chromium.org,jochen@chromium.org

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

Bug: 863309
Change-Id: Ib6eda55a3b0889646c43ea3e7bfccdb590cea0b2
Reviewed-on: https://chromium-review.googlesource.com/1180763
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584347}