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This patch triages the following WPT failures:

external/wpt/css/css-pseudo/selection-input-011.html
external/wpt/css/css-pseudo/selection-textarea-011.html
external/wpt/css/css-pseudo/selection-intercharacter-011.html
external/wpt/css/css-pseudo/selection-intercharacter-012.html
external/wpt/css/css-pseudo/selection-contenteditable-011.html

Bug: 1110286, 1110495, 1110504, 1110512
Change-Id: I975519913dad329eb883b31140210615c7cf932d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324940
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792815}