Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/TestExpectations

 # Intentional failures to test the layout test system.
 Bug(intentional) harness-tests/crash.html [ Crash ]
 Bug(intentional) harness-tests/timeout.html [ Timeout ]
 
 # TODO(qyearsley): Remove these lines and uncomment other test expectation
 # lines related to CSS tests (crbug.com/706118).
 crbug.com/706118 external/wpt/css/css-scoping-1 [ Skip ]
 crbug.com/706118 external/wpt/css/css-shapes-1 [ Skip ]
 crbug.com/706118 external/wpt/css/css-text-3 [ Skip ]
 crbug.com/706118 external/wpt/css/css-writing-modes-3 [ Skip ]
@@ skipping 20 matching lines @@
 #  transforms
 # Some additional bugs that are caused by painting problems are also within this section.
 
 # Failures due to SPV2, that don't also fail without SPV2. DO NOT REBASELINE.
 # SPv2 paint properties are still being implemented.
 #
 # These tests should not be rebaselined automatically, as our goal is to exactly match
 # existing tests. We have skipped the entire spv2 directory and are adding [ Pass ] lines
 # as we go. Please remove [ Pass ] lines instead of rebaselining these tests.
 crbug.com/537409 virtual/spv2/ [ Skip ]
-# Begin whitlelisted paint invalidation tests
-crbug.com/647831 virtual/spv2/paint/invalidation/margin.html [ Pass ]
 # End whitlelisted paint invalidation tests
 crbug.com/596780 virtual/spv2/compositing/framesets/composited-frame-alignment.html [ Pass ]
 crbug.com/596780 virtual/spv2/compositing/geometry/outline-change.html [ Pass ]
 crbug.com/600618 virtual/spv2/svg/custom/object-current-scale.html [ Pass ]
 
 # Re-add this once it rebaselines.
 # crbug.com/600618 virtual/spv2/svg/custom/object-sizing-explicit-height.xhtml [ Pass ]
 # SkiaBitLocker should avoid allocating huge offscreen buffer
 crbug.com/605812 [ Mac ] virtual/spv2/fast/overflow/overflow-height-float-not-removed-crash.html [ Skip ]
 crbug.com/605812 [ Mac ] virtual/spv2/fast/overflow/overflow-height-float-not-removed-crash2.html [ Skip ]
@@ skipping 3333 matching lines @@
 
 # Feature Policy changes same-origin allowpaymentrequest behaviour, tests need updating
 crbug.com/718155 payments/payment-request-in-iframe.html [ Failure ]
 crbug.com/718155 payments/payment-request-in-iframe-nested-not-allowed.html [ Failure ]
 
 # Layout Tests on Swarming (Windows) - https://crbug.com/717347
 crbug.com/719298 [ Win ] fast/dnd/dropEffect-for-effectAllowed.html [ Failure Pass Timeout ]
 crbug.com/719299 [ Win ] external/wpt/css/css-ui-3/outline-004.html [ Failure Pass Timeout ]
 
 crbug.com/719837 [ Debug ] inspector/sources/debugger/rethrow-error-from-bindings-crash.html [ Timeout ]