Normalize URIs on entry to ValidatingInstrumentation.

pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart

Index: pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
index 652f955616c3cd42080d9f29164136acc063020b..b03573cce8f5dd2a9cb3945c9e01b60d79e4f92e 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_inference_engine.dart
@@ -143,10 +143,6 @@ abstract class TypeInferenceEngineImpl extends TypeInferenceEngine {
   /// a previous call to [createTopLevelTypeInferrer].
   TypeInferrerImpl getFieldTypeInferrer(KernelField field);
 
-  /// Gets the URI of the compilation unit the [field] is declared in.
-  /// TODO(paulberry): can we remove this?
-  String getFieldUri(KernelField field);
-
   /// Performs type inference on the given [field].
   void inferField(FieldNode fieldNode) {
     var field = fieldNode._field;