Also remove import

Author: k-fish

packages/tracing/src/browser/browsertracing.ts

@@ -6,7 +6,7 @@ import { startIdleTransaction } from '../hubextensions';
 import { DEFAULT_FINAL_TIMEOUT, DEFAULT_IDLE_TIMEOUT } from '../idletransaction';
 import { extractTraceparentData } from '../utils';
 import { registerBackgroundTabDetection } from './backgroundtab';
-import { addPerformanceEntries, startTrackingLongTasks, startTrackingWebVitals } from './metrics';
+import { addPerformanceEntries, startTrackingWebVitals } from './metrics';
 import {
   defaultRequestInstrumentationOptions,
   instrumentOutgoingRequests,