Remove unused vars and revert tests

Author: qdpham13

firebase-config/src/main/java/com/google/firebase/remoteconfig/internal/ConfigFetchHandler.java

@@ -87,10 +87,6 @@ public class ConfigFetchHandler {
 
   /** Custom Http header key to identify the fetch type. */
   private static final String X_FIREBASE_RC_FETCH_TYPE = "X-Firebase-RC-Fetch-Type";
-  /** Fetch identifier for Realtime. */
-  private static final String REALTIME_FETCH_TYPE = "Realtime";
-  /** Fetch identifier for Base. */
-  private static final String BASE_FETCH_TYPE = "Base";
 
   private final FirebaseInstallationsApi firebaseInstallations;
   private final Provider<AnalyticsConnector> analyticsConnector;

firebase-config/src/test/java/com/google/firebase/remoteconfig/internal/ConfigFetchHandlerTest.java

@@ -794,7 +794,7 @@ private void setBackendResponseToNoChange(Date date) throws Exception {
             /* customHeaders= */ any(),
             /* firstOpenTime= */ any(),
             /* currentTime= */ any()))
-        .thenReturn(FetchResponse.forBackendHasNoUpdates(date, firstFetchedContainer));
+            .thenReturn(FetchResponse.forBackendHasNoUpdates(date, firstFetchedContainer));
   }
 
   private void fetchCallToBackendThrowsException(int httpErrorCode) throws Exception {