Rename front end shadow classes from "Kernel..." to "Shadow...".

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 81175a2893eb45537d810a9516af00b373a81479..03aef2b5407f4be8a164ec2b09ff7a587e915a99 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
@@ -73,7 +73,7 @@ import 'kernel_builder.dart'
         TypeVariableBuilder,
         isRedirectingGenerativeConstructorImplementation;
 
-import 'kernel_shadow_ast.dart' show KernelProcedure;
+import 'kernel_shadow_ast.dart' show ShadowProcedure;
 
 abstract class KernelFunctionBuilder
     extends ProcedureBuilder<KernelTypeBuilder> {
@@ -203,7 +203,7 @@ abstract class KernelFunctionBuilder
 }
 
 class KernelProcedureBuilder extends KernelFunctionBuilder {
-  final KernelProcedure procedure;
+  final ShadowProcedure procedure;
   final int charOpenParenOffset;
 
   AsyncMarker actualAsyncModifier = AsyncMarker.Sync;
@@ -225,7 +225,7 @@ class KernelProcedureBuilder extends KernelFunctionBuilder {
       int charEndOffset,
       [String nativeMethodName,
       this.redirectionTarget])
-      : procedure = new KernelProcedure(null, kind, null, returnType == null,
+      : procedure = new ShadowProcedure(null, kind, null, returnType == null,
             fileUri: compilationUnit?.relativeFileUri)
           ..fileOffset = charOffset
           ..fileEndOffset = charEndOffset,