Create KernelVariableDeclaration for formal parameters.

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

Index: pkg/front_end/lib/src/fasta/kernel/kernel_formal_parameter_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_formal_parameter_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_formal_parameter_builder.dart
index 51ed06a757a19f07d7b6d4c78350bbdf4ae20ba0..86b03071e5c80ddceb89edb85250548eef6d57ff 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_formal_parameter_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_formal_parameter_builder.dart
@@ -4,7 +4,9 @@
 
 library fasta.kernel_formal_parameter_builder;
 
-import 'package:kernel/ast.dart' show DynamicType, VariableDeclaration;
+import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart'
+    show KernelVariableDeclaration;
+import 'package:kernel/ast.dart' show DynamicType;
 
 import 'kernel_builder.dart'
     show
@@ -16,7 +18,7 @@ import 'kernel_builder.dart'
 
 class KernelFormalParameterBuilder
     extends FormalParameterBuilder<KernelTypeBuilder> {
-  VariableDeclaration declaration;
+  KernelVariableDeclaration declaration;
   final int charOffset;
 
   KernelFormalParameterBuilder(
@@ -30,13 +32,13 @@ class KernelFormalParameterBuilder
       : super(metadata, modifiers, type, name, hasThis, compilationUnit,
             charOffset);
 
-  VariableDeclaration build(LibraryBuilder library) {
-    return declaration ??= new VariableDeclaration(name,
+  KernelVariableDeclaration get target => declaration;
+
+  KernelVariableDeclaration build(LibraryBuilder library) {
+    return declaration ??= new KernelVariableDeclaration(name, 0,
         type: type?.build(library) ?? const DynamicType(),
         isFinal: isFinal,
         isConst: isConst)
       ..fileOffset = charOffset;
   }
-
-  VariableDeclaration get target => declaration;
 }