Added helper for clearing cookie items

Author: Prithvi Kanherkar

lib/msal-core/src/cache/AuthCache.ts

@@ -141,10 +141,10 @@ export class AuthCache extends BrowserStorage {// Singleton
     }
 
     public clearMsalCookie(): void {
-        this.setItemCookie(CacheKeys.NONCE_IDTOKEN, "", -1);
-        this.setItemCookie(CacheKeys.STATE_LOGIN, "", -1);
-        this.setItemCookie(CacheKeys.LOGIN_REQUEST, "", -1);
-        this.setItemCookie(CacheKeys.STATE_ACQ_TOKEN, "", -1);
+        this.clearItemCookie(CacheKeys.NONCE_IDTOKEN);
+        this.clearItemCookie(CacheKeys.STATE_LOGIN);
+        this.clearItemCookie(CacheKeys.LOGIN_REQUEST);
+        this.clearItemCookie(CacheKeys.STATE_ACQ_TOKEN);
     }
 
     /**

lib/msal-core/src/cache/BrowserStorage.ts

@@ -94,6 +94,10 @@ export class BrowserStorage {// Singleton
         return "";
     }
 
+    clearItemCookie(cName: string) {
+        this.setItemCookie(cName, "", -1);
+    }
+
     getCookieExpirationTime(cookieLifeDays: number): string {
         const today = new Date();
         const expr = new Date(today.getTime() + cookieLifeDays * 24 * 60 * 60 * 1000);