Enable test for persistent overlays

The test has been implemented in [1] and now, when DevTools rolled,
it can be enabled.

[1]: crrev.com/c/2400478

Bug: 1109224
Change-Id: I43e4dffbf7d50eae856b5c78290768079094ab69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435188Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811260}

third_party/blink/web_tests/TestExpectations

@@ -1837,9 +1837,6 @@ crbug.com/1051044 external/wpt/css/filter-effects/effect-reference-feimage-003.h
 
 crbug.com/524160 [ Debug ] http/tests/media/media-source/stream_memory_tests/mediasource-appendbuffer-quota-exceeded-default-buffers.html [ Timeout ]
 
-# Awaiting DevTools roll.
-crbug.com/1109224 inspector-protocol/overlay/overlay-persistent-overlays.js [ Pass Failure ]
-
 # On these platforms (all but Android) media tests don't currently use gpu-accelerated (proprietary) codecs, so no
 # benefit to running them again with gpu acceleration enabled.
 crbug.com/555703 [ Linux ] virtual/media-gpu-accelerated/* [ Skip ]