Remove unused variable

Bug: 205124386
Change-Id: I14100c20c06a23257312a24d1ef998e848575787
Test: presubmit
diff --git a/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java b/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
index 9088cb9..000b6d2 100644
--- a/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
+++ b/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
@@ -2264,7 +2264,6 @@
                     indexOfRouteProviderInfoByUniqueId(provider.getUniqueId(), mLastProviderInfos);
             MediaRoute2ProviderInfo oldInfo =
                     providerInfoIndex == -1 ? null : mLastProviderInfos.get(providerInfoIndex);
-            MediaRouter2ServiceImpl mediaRouter2Service = mServiceRef.get();
 
             if (oldInfo == newInfo) {
                 // Nothing to do.