[Sheriff] wpt/editing/run: Allow removeformat.html to timeout again.

In https://chromium-review.googlesource.com/c/chromium/src/+/1205917:
"Set longer timeout to all tests in wpt/editing/run/", the test
external/wpt/editing/run/removeformat.html 's Timeout expectation was
removed (along with reference to crbug.com/813098). Likely as a result,
WebKit Linux Trusty Leak is flaking in webkit_layout_test for
removeformat.html. This CL undos the particular change to remove noise.

TBR=tkent@chromium.org,yoichio@chormium.org

Bug: 813098
Change-Id: I632084ec48cd8e3fb670a8d20c1210440b13fdc7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1207011Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588863}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1903,6 +1903,8 @@ crbug.com/627706 external/wpt/html/semantics/embedded-content/the-img-element/in
 
 crbug.com/860211 [ Mac ] external/wpt/editing/run/delete.html [ Failure ]
 
+crbug.com/813098 external/wpt/editing/run/removeformat.html [ Timeout Pass ]
+
 crbug.com/821455 editing/pasteboard/drag-files-to-editable-element.html [ Failure ]
 
 crbug.com/688613 external/wpt/mediacapture-streams/MediaStreamTrack-MediaElement-disabled-audio-is-silence.https.html [ Skip ]