util: update definition of DISALLOW_COPY_AND_ASSIGN macro

PR-URL: #23092
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: nitsakh

src/util.h

@@ -90,10 +90,8 @@ NO_RETURN void Assert(const char* const (*args)[4]);
 void DumpBacktrace(FILE* fp);
 
 #define DISALLOW_COPY_AND_ASSIGN(TypeName)                                    \
-  void operator=(const TypeName&) = delete;                                   \
-  void operator=(TypeName&&) = delete;                                        \
   TypeName(const TypeName&) = delete;                                         \
-  TypeName(TypeName&&) = delete
+  TypeName& operator=(const TypeName&) = delete
 
 // Windows 8+ does not like abort() in Release mode
 #ifdef _WIN32