[Sync] Refactoring of sync integration test checkers to remove boilerplate await methods.

chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc

Index: chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc
diff --git a/chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc b/chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc
index f6a5a61f2212920a0c3380a5d8bf8632598b3e84..b6a32dc5676eea7f0752950228054bd2dd492a68 100644
--- a/chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc
+++ b/chrome/browser/sync/test/integration/single_client_wifi_credentials_sync_test.cc
@@ -6,15 +6,14 @@
 
 #include "base/command_line.h"
 #include "base/macros.h"
-#include "chrome/browser/sync/test/integration/sync_integration_test_util.h"
 #include "chrome/browser/sync/test/integration/sync_test.h"
+#include "chrome/browser/sync/test/integration/updated_progress_marker_checker.h"
 #include "chrome/browser/sync/test/integration/wifi_credentials_helper.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/browser_sync/browser_sync_switches.h"
 #include "components/wifi_sync/wifi_credential.h"
 #include "components/wifi_sync/wifi_security_class.h"
 
-using sync_integration_test_util::AwaitCommitActivityCompletion;
 using wifi_sync::WifiCredential;
 
 using WifiCredentialSet = wifi_sync::WifiCredential::CredentialSet;
@@ -71,6 +70,7 @@ IN_PROC_BROWSER_TEST_F(SingleClientWifiCredentialsSyncTest, SingleCredential) {
   EXPECT_EQ(WifiCredential::MakeSsidBytesForTest(ssid),
             verifier_credentials.begin()->ssid());
 
-  ASSERT_TRUE(AwaitCommitActivityCompletion(GetSyncService(profile_index)));
+  ASSERT_TRUE(
+      UpdatedProgressMarkerChecker(GetSyncService(profile_index)).Wait());
   EXPECT_TRUE(wifi_credentials_helper::ProfileMatchesVerifier(profile_index));
 }