Remove MissingTypeError to remove duplicate warnings (issue 24610)

pkg/analyzer/lib/src/task/strong/info.dart

Index: pkg/analyzer/lib/src/task/strong/info.dart
diff --git a/pkg/analyzer/lib/src/task/strong/info.dart b/pkg/analyzer/lib/src/task/strong/info.dart
index 1f7caf679ca8037c76a1c93d05cf6850f6e44791..a18f76fe36f45b3b82d84d70e6ed8d7196461b05 100644
--- a/pkg/analyzer/lib/src/task/strong/info.dart
+++ b/pkg/analyzer/lib/src/task/strong/info.dart
@@ -435,20 +435,6 @@ class InvalidMethodOverride extends InvalidOverride {
   String get message => _messageHelper('Invalid override');
 }
 
-/// Used to mark unexpected situations in our compiler were we couldn't compute
-/// the type of an expression.
-// TODO(sigmund): This is normally a result of another error that is caught by
-// the analyzer, so this should likely be removed in the future.
-class MissingTypeError extends StaticInfo {
-  final AstNode node;
-  toErrorCode() => new StaticTypeWarningCode(name, message);
-
-  MissingTypeError(this.node);
-
-  @override List<Object> get arguments => [node, node.runtimeType];
-  String get message => "type analysis didn't compute the type of: {0} {1}";
-}
-
 /// Dart constructors have one weird quirk, illustrated with this example:
 ///
 ///     class Base {