[parser] Dot shorthands: Remove synthetic token in parser. Context: A while back, I inserted a synthetic token in the parser to allow us to parse without crashing the analyzer while I worked on the CFE. Now that both implementations are up and working, we can remove this synthetic token and allow the parser to parse as if we had enabled dot shorthands by default, and produce an error if the experiment isn't enabled. This change allows a bunch of different language tests to start passing since they were blocked on the weird synthetic token messing up the parsing stream. Bug: https://github.com/dart-lang/sdk/issues/59758 Change-Id: I792e3b917a76241b04ee708de06f670bbde64036 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/423563 Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Kallen Tu <kallentu@google.com>
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