[dart:html] Delete unused private methods The outdated custom element support has already been removed so these methods are no longer needed. Removes an access of `.__proto__`. Issue: https://github.com/dart-lang/sdk/issues/52372 CoreLibraryReviewExempt: Change in web only library Change-Id: Ia55c3be7f6c19433234c02b90981424e973866aa Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/304781 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com>
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