Remove summary-related code from pkg/front_end/tool/perf.dart. This was needed back when we thought the front end would be based on the analyzer, and so we thought its performance characteristics would depend on those of the analyzer summary mechanism. But since the front end is not based on the analyzer, and the performance of the analyzer summary mechanism is performance tested elsewhere, we can remove this code. Removing it will make it easier to do some re-work of summaries that is needed for Dart 2.1 support. Change-Id: I4aa8b5251f26ba7fd59b99d325c66da642d410ed Reviewed-on: https://dart-review.googlesource.com/71661 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
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