14c7c3c556
Fix: ShadowElement is not always present. Original: Committed: https://github.com/dart-lang/sdk/commit/b7b12b564a3e1811ccfca3e28fe30dde685f6633 Reverted: https://github.com/dart-lang/sdk/commit/963df1e3e1a3bac0013d191d2b02898bbebefa9d BUG= Review-Url: https://codereview.chromium.org/2718713003 .