Update TestExpectations for flaky tests on Win7.

The flaky tests are:

external/wpt/editing/run/delete.html?1-1000
external/wpt/editing/run/delete.html?1001-2000
external/wpt/editing/run/delete.html?3001-4000
external/wpt/editing/run/delete.html?4001-5000
external/wpt/editing/run/delete.html?5001-6000
external/wpt/editing/run/delete.html?6001-last
external/wpt/editing/run/forward_delete.html?1-1000
external/wpt/editing/run/forward_delete.html?1001-2000
external/wpt/editing/run/forward_delete.html?2001-3000
external/wpt/editing/run/forward_delete.html?3001-4000
external/wpt/editing/run/forward_delete.html?4001-5000
external/wpt/editing/run/forward_delete.html?5001-6000
external/wpt/editing/run/forward_delete.html?6001-last

external/wpt/editing/run/delete.html?2001-3000 isn't in this list since
it's already disabled elsewhere in this TestExpectations file.

TBR=foolip@chromium.org

Bug: 877104
Change-Id: I01dd8218bddc9c1c726da03a062a714fc4f1f56c
Reviewed-on: https://chromium-review.googlesource.com/1188896Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586060}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5061,7 +5061,16 @@ crbug.com/872138 external/wpt/client-hints/accept_ch.tentative.https.html [ Time
 crbug.com/877183 [ Linux Win ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-003v.html [ Pass Failure ]
 
 # Sheriff 2018-08-24
-crbug.com/877104 external/wpt/editing/run/delete.html?1-1000 [ Timeout Pass ]
-crbug.com/877299 external/wpt/editing/run/forwarddelete.html?1-1000 [ Timeout Pass ]
-crbug.com/877292 external/wpt/editing/run/forwarddelete.html?2001-3000 [ Timeout Pass ]
-crbug.com/877293 external/wpt/editing/run/forwarddelete.html?3001-4000 [ Timeout Pass ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?1-1000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?1001-2000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?3001-4000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?4001-5000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?5001-6000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/delete.html?6001-last [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?1-1000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?1001-2000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?2001-3000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?3001-4000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?4001-5000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?5001-6000 [ Timeout Pass Failure ]
+crbug.com/877104 [ Win7 ] external/wpt/editing/run/forward_delete.html?6001-last [ Timeout Pass Failure ]