Fix the more specific relation.

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

Index: sdk/lib/_internal/compiler/implementation/warnings.dart
diff --git a/sdk/lib/_internal/compiler/implementation/warnings.dart b/sdk/lib/_internal/compiler/implementation/warnings.dart
index fb33d49c1e11ecdec11f809c0cd70d52441fd712..e309853464280d88dfb1dda91bff48d260e8eab0 100644
--- a/sdk/lib/_internal/compiler/implementation/warnings.dart
+++ b/sdk/lib/_internal/compiler/implementation/warnings.dart
@@ -1353,12 +1353,6 @@ Please include the following information:
       "'#{shownType}' because '#{shownType}' is not more specific than the "
       "known type '#{knownType}' of '#{variableName}'.");
 
-  static const MessageKind NOT_MORE_SPECIFIC_RAW = const MessageKind(
-      "Hint: Variable '#{variableName}' is not shown to have type "
-      "'#{shownType}' because '#{shownType}' is not more specific than the "
-      "known type '#{knownType}' of '#{variableName}'.",
-      howToFix: "Try replacing '#{shownType}' with '#{shownTypeRaw}'.");
-
   //////////////////////////////////////////////////////////////////////////////
   // Patch errors start.
   //////////////////////////////////////////////////////////////////////////////