Remove Timeout expectation for a layout test

detection-HTMLVideoElement.html:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=shapedetection/detection-HTMLVideoElement.html
show that this test is not timeout-flaky any more.

Bug: 726075
Change-Id: I8acaf8f01f91eaee4b5c07f801fa30ae7dbc27dd
Reviewed-on: https://chromium-review.googlesource.com/1135701Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575246}

third_party/WebKit/LayoutTests/TestExpectations

@@ -102,7 +102,6 @@ crbug.com/845267 [ Mac ] http/tests/inspector-protocol/page/page-lifecycleEvents
 
 # SwiftShader Failures
 crbug.com/726075 [ Win Linux Mac ] compositing/3d-cube.html [ Failure ]
-crbug.com/726075 [ Linux ] shapedetection/detection-HTMLVideoElement.html [ Timeout ]
 
 # Looks like a filuare to get a paint on time. Test could be changed to use runAfterLayoutAndPaint
 # instead of a timeout, which may fix things.