Remove cancel and make crash exit with code 253.

sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart

Index: sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart
diff --git a/sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart b/sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart
index dd70c694d817c26fb816388419b51d884ebcd170..40d77b10f8f3cac4c9a58eddf7028691fd16458c 100644
--- a/sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart
+++ b/sdk/lib/_internal/compiler/implementation/diagnostic_listener.dart
@@ -5,18 +5,17 @@
 part of dart2js;
 
 abstract class DiagnosticListener {
-  // TODO(karlklose): replace cancel with better error reporting mechanism.
-  void cancel(String reason, {node, token, instruction, element});
   // TODO(karlklose): rename log to something like reportInfo.
   void log(message);
 
-  void internalErrorOnElement(Element element, String message);
-  void internalError(String message,
-                     {Node node, Token token, HInstruction instruction,
-                      Element element});
+  void internalError(Spannable spannable, message);
 
   SourceSpan spanFromSpannable(Spannable node);
 
+  /// Reports an error and terminates computation immediately.
+  void reportFatalError(Spannable node, MessageKind errorCode,
+                        [Map arguments = const {}]);
+
   void reportError(Spannable node, MessageKind errorCode,
                    [Map arguments = const {}]);