Use 'UnitResult' type parameter instead of 'T' in CorrectionProducerContext.

Change-Id: I24c7f9450f6ad84de6e67a2fb2f70d6dea7983e6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/311158
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Keerti Parthasarathy <[email protected]>

Author: scheglov

pkg/analysis_server/lib/src/services/correction/dart/abstract_producer.dart

@@ -102,7 +102,7 @@ abstract class CorrectionProducer<T extends ParsedUnitResult>
   Future<void> compute(ChangeBuilder builder);
 }
 
-class CorrectionProducerContext<T extends ParsedUnitResult> {
+class CorrectionProducerContext<UnitResult extends ParsedUnitResult> {
   final int selectionOffset;
   final int selectionLength;
   final int selectionEnd;
@@ -113,7 +113,7 @@ class CorrectionProducerContext<T extends ParsedUnitResult> {
 
   final AnalysisSession session;
   final AnalysisSessionHelper sessionHelper;
-  final T unitResult;
+  final UnitResult unitResult;
   final ChangeWorkspace workspace;
 
   /// TODO(migration) Make it non-nullable, specialize "fix" context?