8345286: Remove use of SecurityManager API from misc areas

Reviewed-by: alanb, kevinw, sgehwolf

src/java.base/share/classes/java/lang/String.java

@@ -549,7 +549,6 @@ public final class String
      * Important: parameter order of this method is deliberately changed in order to
      * disambiguate it against other similar methods of this class.
      */
-    @SuppressWarnings("removal")
     private String(Charset charset, byte[] bytes, int offset, int length) {
         if (length == 0) {
             this.value = "".value;
@@ -787,7 +786,6 @@ public final class String
         }
     }
 
-    @SuppressWarnings("removal")
     private static String newStringNoRepl1(byte[] src, Charset cs) {
         int len = src.length;
         if (len == 0) {