Disable flaky PolicyWatcherTest.TestRealChromotingPolicy on ASAN.
Disable flaky PolicyWatcherTest.TestRealChromotingPolicy on ASAN.

BUG=517918
TBR=lukasza@chromium.org

Review URL: https://codereview.chromium.org/1283463002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#343541}

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