Revert two Kernel changes that were causing test failures.

pkg/front_end/lib/src/fasta/builder/procedure_builder.dart

Index: pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart b/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
index bdb52cfd46e2f51aec9bd0869c04dd3e2a288f11..e5875a4c551cf579d2f31aad3489efc9b5310186 100644
--- a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
@@ -34,7 +34,6 @@ abstract class ProcedureBuilder<T extends TypeBuilder> extends MemberBuilder {
   final List<FormalParameterBuilder> formals;
 
   ProcedureBuilder(
-      String documentationComment,
       this.metadata,
       this.modifiers,
       this.returnType,
@@ -43,7 +42,7 @@ abstract class ProcedureBuilder<T extends TypeBuilder> extends MemberBuilder {
       this.formals,
       LibraryBuilder compilationUnit,
       int charOffset)
-      : super(compilationUnit, charOffset, documentationComment);
+      : super(compilationUnit, charOffset);
 
   String get debugName => "ProcedureBuilder";