sync: Refactor CreateRoot() test helper function

sync/internal_api/public/test/test_user_share.h

Index: sync/internal_api/public/test/test_user_share.h
diff --git a/sync/internal_api/public/test/test_user_share.h b/sync/internal_api/public/test/test_user_share.h
index 5322d909615f411b43852af82e9e24ea7742ee63..507a2ed09ebc10fb778407e80daa74e2ead88ac4 100644
--- a/sync/internal_api/public/test/test_user_share.h
+++ b/sync/internal_api/public/test/test_user_share.h
@@ -31,12 +31,12 @@
 #define SYNC_INTERNAL_API_PUBLIC_TEST_TEST_USER_SHARE_H_
 
 #include "base/basictypes.h"
+#include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/user_share.h"
 
 namespace syncer {
 
 class SyncEncryptionHandler;
-
 class TestDirectorySetterUpper;
 
 class TestUserShare {
@@ -61,6 +61,10 @@ class TestUserShare {
   // methods normally handled via the SyncBackendHost
   SyncEncryptionHandler* encryption_handler();
 
+  // A helper function to pretend to download this type's root node.
+  static bool CreateRoot(syncer::ModelType model_type,
+                         syncer::UserShare* service);
+
  private:
   scoped_ptr<TestDirectorySetterUpper> dir_maker_;
   scoped_ptr<UserShare> user_share_;