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Part 2 of the renaming to create the new parent type. Also modifies some existing tests to reflect the change in name and function of JavaScriptObject. Change-Id: If37f34dd8477b7fc1fe459d3225ecf2537fb9f1a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/217156 Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Mayank Patke <fishythefish@google.com>