Mark wpt/.../clients-matchall-order.https.html as Timeout

It's marked as Skip but we cannot investigate the failure without
running it.

Bug: 870173
Change-Id: I110fdf24cbe625974f9596deaedcee88a92e384e
Reviewed-on: https://chromium-review.googlesource.com/c/1334990Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607962}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1795,9 +1795,7 @@ crbug.com/538697 [ Win ] printing/webgl-oversized-printing.html [ Failure Crash
 crbug.com/867834 virtual/outofblink-cors/http/tests/security/isolatedWorld/cross-origin-xhr.html [ Crash ]
 
 # Timeout tests in dictionary order.
-# Using Skip because this is listed as a Slow test, so if Timeout is used it
-# will waste 30 or 90 seconds per run.
-crbug.com/870173 [ Mac ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/clients-matchall-order.https.html [ Skip ]
+crbug.com/870173 [ Mac ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/clients-matchall-order.https.html [ Timeout Pass ]
 
 # Failing tests in dictionary order.
 crbug.com/870173 virtual/outofblink-cors/http/tests/security/img-redirect-to-crossorigin-credentials.html [ Failure ]