Invalidate IPWL_FocusHandler and IPWL_Provider on destruction.

BUG=572871
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1564773003 .

(cherry picked from commit dcac57bc8b64fdc870d79d11a498ae7021cf8ae7)

Review URL: https://codereview.chromium.org/1569663002 .

2 files changed, 209 insertions, 0 deletions

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diff --git a/testing/resources/bug_572871.pdf b/testing/resources/bug_572871.pdf
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