Revert two Kernel changes that were causing test failures.

pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart
index 5da69b667122d097700b568ebf3f0fc80553e1bd..27d69152aaec93f9db813f856a41a7b87e9819b6 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_procedure_builder.dart
@@ -81,7 +81,6 @@ abstract class KernelFunctionBuilder
   Statement actualBody;
 
   KernelFunctionBuilder(
-      String documentationComment,
       List<MetadataBuilder> metadata,
       int modifiers,
       KernelTypeBuilder returnType,
@@ -91,8 +90,8 @@ abstract class KernelFunctionBuilder
       KernelLibraryBuilder compilationUnit,
       int charOffset,
       this.nativeMethodName)
-      : super(documentationComment, metadata, modifiers, returnType, name,
-            typeVariables, formals, compilationUnit, charOffset);
+      : super(metadata, modifiers, returnType, name, typeVariables, formals,
+            compilationUnit, charOffset);
 
   void set body(Statement newBody) {
     if (newBody != null) {
@@ -208,7 +207,6 @@ class KernelProcedureBuilder extends KernelFunctionBuilder {
   final ConstructorReferenceBuilder redirectionTarget;
 
   KernelProcedureBuilder(
-      String documentationComment,
       List<MetadataBuilder> metadata,
       int modifiers,
       KernelTypeBuilder returnType,
@@ -226,17 +224,8 @@ class KernelProcedureBuilder extends KernelFunctionBuilder {
             fileUri: compilationUnit?.relativeFileUri)
           ..fileOffset = charOffset
           ..fileEndOffset = charEndOffset,
-        super(
-            documentationComment,
-            metadata,
-            modifiers,
-            returnType,
-            name,
-            typeVariables,
-            formals,
-            compilationUnit,
-            charOffset,
-            nativeMethodName);
+        super(metadata, modifiers, returnType, name, typeVariables, formals,
+            compilationUnit, charOffset, nativeMethodName);
 
   ProcedureKind get kind => procedure.kind;
 
@@ -287,7 +276,6 @@ class KernelProcedureBuilder extends KernelFunctionBuilder {
       procedure.isExternal = isExternal;
       procedure.isConst = isConst;
       procedure.name = new Name(name, library.target);
-      procedure.documentationComment = documentationComment;
     }
     if (isEligibleForTopLevelInference) {
       library.loader.typeInferenceEngine.recordMember(procedure);
@@ -322,7 +310,6 @@ class KernelConstructorBuilder extends KernelFunctionBuilder {
   RedirectingInitializer redirectingInitializer;
 
   KernelConstructorBuilder(
-      String documentationComment,
       List<MetadataBuilder> metadata,
       int modifiers,
       KernelTypeBuilder returnType,
@@ -337,17 +324,8 @@ class KernelConstructorBuilder extends KernelFunctionBuilder {
       : constructor = new Constructor(null)
           ..fileOffset = charOffset
           ..fileEndOffset = charEndOffset,
-        super(
-            documentationComment,
-            metadata,
-            modifiers,
-            returnType,
-            name,
-            typeVariables,
-            formals,
-            compilationUnit,
-            charOffset,
-            nativeMethodName);
+        super(metadata, modifiers, returnType, name, typeVariables, formals,
+            compilationUnit, charOffset, nativeMethodName);
 
   bool get isInstanceMember => false;
 
@@ -370,7 +348,6 @@ class KernelConstructorBuilder extends KernelFunctionBuilder {
       constructor.isConst = isConst;
       constructor.isExternal = isExternal;
       constructor.name = new Name(name, library.target);
-      constructor.documentationComment = documentationComment;
     }
     return constructor;
   }