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TypeArgumentClassFinder.FindClass always returns null (because non-null values are never stored to TypeArgumentClassFinder::klass_). Consequently, code using TypeArgumentClassFinder (TypeUsageInfo::PropagateTypeArguments) seems to be redundant and can be removed, along with another utility class TypeArgumentInstantiator. TEST=ci Cq-Include-Trybots: luci.dart.try:vm-aot-linux-debug-x64-try,vm-aot-linux-release-x64-try Change-Id: I7bfc98e5c4d5b4d3effa639031ae4bd6dce25643 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/295382 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>