chore: add missing required overrides to symbol properties

PiperOrigin-RevId: 676149134

Author: material-web-copybara

labs/behaviors/constraint-validation_test.ts

@@ -32,15 +32,15 @@ describe('mixinConstraintValidation()', () => {
       return html`<div id="root"></div>`;
     }
 
-    [createValidator]() {
+    override [createValidator]() {
       return new CheckboxValidator(() => this);
     }
 
-    [getValidityAnchor]() {
+    override [getValidityAnchor]() {
       return this.shadowRoot?.querySelector<HTMLElement>('#root') ?? null;
     }
 
-    [getFormValue]() {
+    override [getFormValue]() {
       return String(this.checked);
     }
   }

labs/behaviors/on-report-validity_test.ts

@@ -38,15 +38,15 @@ describe('mixinOnReportValidity()', () => {
       return html`<div id="root"></div>`;
     }
 
-    [createValidator]() {
+    override [createValidator]() {
       return new CheckboxValidator(() => this);
     }
 
-    [getValidityAnchor]() {
+    override [getValidityAnchor]() {
       return this.shadowRoot?.querySelector<HTMLElement>('#root') ?? null;
     }
 
-    [getFormValue]() {
+    override [getFormValue]() {
       return String(this.checked);
     }
   }

radio/internal/radio.ts

@@ -183,7 +183,7 @@ export class Radio extends radioBaseClass {
     this.checked = state === 'true';
   }
 
-  [createValidator]() {
+  override [createValidator]() {
     return new RadioValidator(() => {
       if (!this.selectionController) {
         // Validation runs on superclass construction, so selection controller
@@ -195,7 +195,7 @@ export class Radio extends radioBaseClass {
     });
   }
 
-  [getValidityAnchor]() {
+  override [getValidityAnchor]() {
     return this.container;
   }
 }

switch/internal/switch.ts

@@ -241,14 +241,14 @@ export class Switch extends switchBaseClass {
     this.selected = state === 'true';
   }
 
-  [createValidator]() {
+  override [createValidator]() {
     return new CheckboxValidator(() => ({
       checked: this.selected,
       required: this.required,
     }));
   }
 
-  [getValidityAnchor]() {
+  override [getValidityAnchor]() {
     return this.input;
   }
 }