sync: move internal_api components used by chrome/browser into internal_api/public

sync/test/engine/test_directory_setter_upper.h

Index: sync/test/engine/test_directory_setter_upper.h
diff --git a/sync/test/engine/test_directory_setter_upper.h b/sync/test/engine/test_directory_setter_upper.h
index 92441380f542a58f279dbfa42714f41b7eef33c1..7e2f89471fbc901f5fc692eb86b4f72c6323dceb 100644
--- a/sync/test/engine/test_directory_setter_upper.h
+++ b/sync/test/engine/test_directory_setter_upper.h
@@ -36,12 +36,15 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/scoped_temp_dir.h"
-#include "sync/util/test_unrecoverable_error_handler.h"
-#include "sync/syncable/syncable.h"
 #include "sync/test/fake_encryptor.h"
 #include "sync/test/null_directory_change_delegate.h"
+#include "sync/util/test_unrecoverable_error_handler.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
+namespace syncable {
+  class Directory;
+}
+
 namespace browser_sync {
 
 class TestDirectorySetterUpper {
@@ -59,11 +62,10 @@ class TestDirectorySetterUpper {
 
   syncable::Directory* directory() { return directory_.get(); }
 
- protected:
+ private:
   syncable::NullDirectoryChangeDelegate delegate_;
   TestUnrecoverableErrorHandler handler_;
 
- private:
   void RunInvariantCheck();
 
   ScopedTempDir temp_dir_;