[Sheriff] Mark service-worker-v8-cache.js as Timeout in TestExpectations

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 789111
Change-Id: I7df38ee8bfce5eb135e6c42e2b6e6d7788a38ac7
Reviewed-on: https://chromium-review.googlesource.com/807524Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521545}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3592,7 +3592,7 @@ crbug.com/786235 http/tests/misc/resource-timing-sizes-tags.html [ Failure Pass
 crbug.com/786641 [ Win Linux ] virtual/gpu/fast/canvas/OffscreenCanvas-2d-imageSmoothing-in-worker.html [ Timeout Pass ]
 
 # Sheriff failures 2017-11-28
-crbug.com/789111 http/tests/devtools/service-workers/service-worker-v8-cache.js [ Pass Failure ]
+crbug.com/789111 http/tests/devtools/service-workers/service-worker-v8-cache.js [ Pass Failure Timeout ]
 crbug.com/789139 [ Linux ] http/tests/devtools/sources/debugger/live-edit-no-reveal.js [ Pass Failure ]
 crbug.com/785179 [ Mac10.11 ] http/tests/devtools/console/console-viewport-stick-to-bottom.js [ Pass Failure ]
 # Sheriff failures 2017-11-29
@@ -3603,7 +3603,7 @@ crbug.com/789478 virtual/prefer_compositing_to_lcd_text/scrollbars/custom-scroll
 crbug.com/789533 virtual/gpu/fast/canvas/OffscreenCanvas-2d-imageSmoothing.html [ Pass Failure ]
 # Sheriff failures 2017-11-30
 crbug.com/789921 [ Win7 ] media/video-controls-overflow-menu-last-button-visible.html [ Pass Failure ]
-crbug.com/789111 virtual/pwa-full-code-cache/http/tests/devtools/service-workers/service-worker-v8-cache.js [ Pass Failure ]
+crbug.com/789111 virtual/pwa-full-code-cache/http/tests/devtools/service-workers/service-worker-v8-cache.js [ Pass Failure Timeout ]
 crbug.com/790025 virtual/gpu-rasterization/images/image-hover-display-alt.html [ Failure Pass ]
 
 # These tests fail often on Linux. https://crbug.com/790549