Log the sync communication that happens between client and server.

sync/engine/syncer_unittest.cc

Index: sync/engine/syncer_unittest.cc
diff --git a/sync/engine/syncer_unittest.cc b/sync/engine/syncer_unittest.cc
index 72ec0572889eae23245b89cc40bc3b820f982e66..9a66d98f248cf441754212d4d72fbe22cd3562ee 100644
--- a/sync/engine/syncer_unittest.cc
+++ b/sync/engine/syncer_unittest.cc
@@ -1027,8 +1027,8 @@ TEST_F(SyncerTest, NigoriConflicts) {
     sync_pb::NigoriSpecifics* nigori = specifics.mutable_nigori();
     cryptographer(&wtrans)->GetKeys(nigori->mutable_encrypted());
     cryptographer(&wtrans)->UpdateNigoriFromEncryptedTypes(nigori);
-    // Normally this would be written as part of SetDecryptionPassphrase, but we
-    // do it manually for the test.
+    // Normally this would be written as part of SetPassphrase, but we do it
+    // manually for the test.
     nigori_entry.Put(SPECIFICS, specifics);
     nigori_entry.Put(IS_UNSYNCED, true);
   }