Remove page reload detection in tests

Our test runner handles this automatically and fails the test with error
code 1.

https://imgur.com/a/JTOQPtU

Release-Notes: skip
Change-Id: Ida8a8ddb0c42a9b2c138d8235c72af79f4487e66
diff --git a/polygerrit-ui/app/test/common-test-setup-karma.ts b/polygerrit-ui/app/test/common-test-setup-karma.ts
index 492d70a..34ec682 100644
--- a/polygerrit-ui/app/test/common-test-setup-karma.ts
+++ b/polygerrit-ui/app/test/common-test-setup-karma.ts
@@ -12,34 +12,4 @@
   let testResolver: typeof testResolverImpl;
 }
 
-let originalOnBeforeUnload: typeof window.onbeforeunload;
-
-suiteSetup(() => {
-  // This suiteSetup() method is called only once before all tests
-
-  // Can't use window.addEventListener("beforeunload",...) here,
-  // the handler is raised too late.
-  originalOnBeforeUnload = window.onbeforeunload;
-  window.onbeforeunload = function (e: BeforeUnloadEvent) {
-    // If a test reloads a page, we can't prevent it.
-    // However we can print an error and the stack trace with assert.fail
-    try {
-      throw new Error();
-    } catch (e) {
-      console.error('Page reloading attempt detected.');
-      if (e instanceof Error) {
-        console.error(e.stack?.toString());
-      }
-    }
-    if (originalOnBeforeUnload) {
-      originalOnBeforeUnload.call(window, e);
-    }
-  };
-});
-
-suiteTeardown(() => {
-  // This suiteTeardown() method is called only once after all tests
-  window.onbeforeunload = originalOnBeforeUnload;
-});
-
 window.testResolver = testResolverImpl;