Report messages instead of just printing.

pkg/front_end/lib/src/base/processed_options.dart

Index: pkg/front_end/lib/src/base/processed_options.dart
diff --git a/pkg/front_end/lib/src/base/processed_options.dart b/pkg/front_end/lib/src/base/processed_options.dart
index a762812b7286264841246efb9153006f33f8a9dd..189cc2aefbc6013a9bbfb49fcebe9ee7c4d81eba 100644
--- a/pkg/front_end/lib/src/base/processed_options.dart
+++ b/pkg/front_end/lib/src/base/processed_options.dart
@@ -113,11 +113,6 @@ class ProcessedOptions {
     return _raw.byteStore;
   }
 
-  // TODO(sigmund,ahe): delete in favor of reportMessage.
-  void deprecated_reportError(String error) {
-    _raw.onError(new _StringMessage(error));
-  }
-
   void reportMessage(LocatedMessage message) {
     _raw.onError(new _CompilationMessage(message));
   }
@@ -374,14 +369,3 @@ class _CompilationMessage implements CompilationError {
 
   String toString() => message;
 }
-
-/// Wraps an error message as a [CompilationError] API.
-class _StringMessage implements CompilationError {
-  final String message;
-  String get tip => null;
-  SourceSpan get span => null;
-
-  _StringMessage(this.message);
-
-  String toString() => message;
-}