Remove number from operator mismatch message.

pkg/front_end/tool/_fasta/generate_messages.dart

Index: pkg/front_end/tool/_fasta/generate_messages.dart
diff --git a/pkg/front_end/tool/_fasta/generate_messages.dart b/pkg/front_end/tool/_fasta/generate_messages.dart
index 9c2faa8a67a119bac5c9aa786a71e731e8ebb12b..500fd9257c2887d0930c8fd0ea0831e58ca1f690 100644
--- a/pkg/front_end/tool/_fasta/generate_messages.dart
+++ b/pkg/front_end/tool/_fasta/generate_messages.dart
@@ -90,11 +90,6 @@ String compileTemplate(String name, String template, String tip,
         arguments.add("'name3': name3");
         break;
 
-      case "#number":
-        parameters.add("int number");
-        arguments.add("'number': number");
-        break;
-
       case "#lexeme":
         parameters.add("Token token");
         conversions.add("String lexeme = token.lexeme;");