Remove unused request UsesTypeWrapperFeature

Author: DougGregor

include/swift/AST/TypeCheckRequests.h

@@ -3783,23 +3783,6 @@ class GetTypeWrapperInitializer
   bool isCached() const { return true; }
 };
 
-/// Check whether this is a protocol that has a type wrapper attribute
-/// or one of its dependencies does.
-class UsesTypeWrapperFeature
-    : public SimpleRequest<UsesTypeWrapperFeature, bool(NominalTypeDecl *),
-                           RequestFlags::Cached> {
-public:
-  using SimpleRequest::SimpleRequest;
-
-private:
-  friend SimpleRequest;
-
-  bool evaluate(Evaluator &evaluator, NominalTypeDecl *) const;
-
-public:
-  bool isCached() const { return true; }
-};
-
 /// Find the definition of a given macro.
 class MacroDefinitionRequest
     : public SimpleRequest<MacroDefinitionRequest,