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

pkg/front_end/lib/src/fasta/source/source_loader.dart

Index: pkg/front_end/lib/src/fasta/source/source_loader.dart
diff --git a/pkg/front_end/lib/src/fasta/source/source_loader.dart b/pkg/front_end/lib/src/fasta/source/source_loader.dart
index 3734675ef92012e66997a2229242408605f06d7a..a5f5ed2a68d796239de913ebf768805e61cc8357 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.dart
@@ -50,7 +50,7 @@ import '../fasta_codes.dart'
         templateInternalProblemUriMissingScheme,
         templateUnspecified;
 
-import '../kernel/kernel_shadow_ast.dart' show KernelTypeInferenceEngine;
+import '../kernel/kernel_shadow_ast.dart' show ShadowTypeInferenceEngine;
 
 import '../kernel/kernel_target.dart' show KernelTarget;
 
@@ -477,7 +477,7 @@ class SourceLoader<L> extends Loader<L> {
 
   void createTypeInferenceEngine() {
     typeInferenceEngine =
-        new KernelTypeInferenceEngine(instrumentation, target.strongMode);
+        new ShadowTypeInferenceEngine(instrumentation, target.strongMode);
   }
 
   /// Performs the first phase of top level initializer inference, which