wpt/css/css-contain/contain-paint-007.html passes

This test no longer fails.  I don't think it is testing the
referenced bug very well either, since the positioning is not
asserted by the test - just the presence.

Bug: 847274
Change-Id: I9213f4d5cbc136027246b56b5d12837e6418775e
Reviewed-on: https://chromium-review.googlesource.com/1131229
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Reviewed-by: Peter Mayo <petermayo@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573891}

third_party/WebKit/LayoutTests/TestExpectations

@@ -258,7 +258,6 @@ crbug.com/785212 external/wpt/css/css-contain/contain-layout-013.html [ Failure
 crbug.com/785212 external/wpt/css/css-contain/contain-layout-014.html [ Failure ]
 crbug.com/847274 external/wpt/css/css-contain/contain-paint-005.html [ Failure ]
 crbug.com/847274 external/wpt/css/css-contain/contain-paint-006.html [ Failure ]
-crbug.com/847274 external/wpt/css/css-contain/contain-paint-007.html [ Failure ]
 
 # ====== Layout team owned tests to here ======