sync: Refactor TwoClientPreferencesSyncTest

chrome/browser/sync/test/integration/sync_test.h

Index: chrome/browser/sync/test/integration/sync_test.h
diff --git a/chrome/browser/sync/test/integration/sync_test.h b/chrome/browser/sync/test/integration/sync_test.h
index c691a37fc9467c3caa424787e05f46de47926934..d973d44e8d223c1924fdc0996f0afbe5f9986277 100644
--- a/chrome/browser/sync/test/integration/sync_test.h
+++ b/chrome/browser/sync/test/integration/sync_test.h
@@ -199,6 +199,9 @@ class SyncTest : public InProcessBrowserTest {
   // Checks if encryption is complete for profile |index|.
   bool IsEncryptionComplete(int index);
 
+  // Waits until IsEncryptionComplete returns true or a timeout is reached.
+  bool AwaitEncryptionComplete(int index);
+
   // Blocks until all sync clients have completed their mutual sync cycles.
   // Returns true if a quiescent state was successfully reached.
   bool AwaitQuiescence();