text-editor-ctrl-d-1.js is slow on Windows Release.

TBR=treib@chromium.org,sfiera@chromium.org

Bug: 808185
Change-Id: Ie18b58450b9893f0f3b8a92f719769fe20eec0c0
Reviewed-on: https://chromium-review.googlesource.com/896772Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533979}

third_party/WebKit/LayoutTests/SlowTests

@@ -474,3 +474,5 @@ crbug.com/765326 virtual/scroll_customization/fast/scroll-behavior/scroll-custom
 
 crbug.com/800359 external/wpt/mimesniff/mime-types/parsing.any.html [ Slow ]
 crbug.com/800359 external/wpt/mimesniff/mime-types/parsing.any.worker.html [ Slow ]
+
+crbug.com/808185 [ Win Release ] http/tests/devtools/editor/text-editor-ctrl-d-1.js [ Slow ]