Gardening: http/tests/inspector/service-workers/service-worker-agents.html crashes

BUG=528198
TBR=horo
NOTRY=true

Review URL: https://codereview.chromium.org/1307233007

git-svn-id: svn://svn.chromium.org/blink/trunk@201788 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -868,6 +868,7 @@ crbug.com/524596 virtual/spv2/paint/invalidation/fixed-position-descendant-paint
 crbug.com/425113 svg/clip-path/clip-path-multiple-children.svg [ ImageOnlyFailure ]
 
 crbug.com/480769 http/tests/inspector/service-workers/service-workers-redundant.html [ Crash Pass Slow Failure ]
+crbug.com/528198 http/tests/inspector/service-workers/service-worker-agents.html [ Crash Pass ]
 
 crbug.com/472330 fast/borders/border-image-outset-split-inline-vertical-lr.html [ ImageOnlyFailure ]
 crbug.com/472330 fast/writing-mode/box-shadow-vertical-lr.html [ ImageOnlyFailure ]