[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/sessions/sync_session_unittest.cc

Index: chrome/browser/sync/sessions/sync_session_unittest.cc
diff --git a/chrome/browser/sync/sessions/sync_session_unittest.cc b/chrome/browser/sync/sessions/sync_session_unittest.cc
index e386e63c44ab8c908433b1aba211148de9dcfcdc..dc9ad8ad6e825f4d102a14fc1e2819fdc4d70a3f 100644
--- a/chrome/browser/sync/sessions/sync_session_unittest.cc
+++ b/chrome/browser/sync/sessions/sync_session_unittest.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/sync/sessions/sync_session.h"
 
 #include "base/memory/ref_counted.h"
+#include "base/tracked.h"
 #include "chrome/browser/sync/engine/conflict_resolver.h"
 #include "chrome/browser/sync/engine/mock_model_safe_workers.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
@@ -123,7 +124,7 @@ TEST_F(SyncSessionTest, SetWriteTransaction) {
   scoped_ptr<SyncSession> session(MakeSession());
   EXPECT_TRUE(NULL == session->write_transaction());
   {
-    WriteTransaction trans(dir, syncable::UNITTEST, __FILE__, __LINE__);
+    WriteTransaction trans(dir, syncable::UNITTEST, FROM_HERE);
     sessions::ScopedSetSessionWriteTransaction set_trans(session.get(), &trans);
     EXPECT_TRUE(&trans == session->write_transaction());
   }