Remove unused code

tp-input.js

@@ -310,7 +310,6 @@ class TpInput extends BaseElement {
     const thisChar = String.fromCharCode(e.charCode);
     if (this._isPrintable(e) && !regex.test(thisChar)) {
       e.preventDefault();
-      this._announceInvalidCharacter('Invalid character ' + thisChar + ' not entered.');
     }
   }
 
@@ -449,10 +448,6 @@ class TpInput extends BaseElement {
     }
   }
 
-  _announceInvalidCharacter(message) {
-    this.fire('iron-announce', { text: message });
-  }
-
   _optionalChanged(oldValue) {
     if (oldValue === undefined) return;