[Android] Fix remaining linker errors for components build

sync/internal_api/public/base/model_type.h

Index: sync/internal_api/public/base/model_type.h
diff --git a/sync/internal_api/public/base/model_type.h b/sync/internal_api/public/base/model_type.h
index 7a95d8c640b851dd931806ba72a132a5762e8373..197e6953ef085e48c8964bcee3f0c8c204a4632f 100644
--- a/sync/internal_api/public/base/model_type.h
+++ b/sync/internal_api/public/base/model_type.h
@@ -276,8 +276,9 @@ bool RealModelTypeToNotificationType(ModelType model_type,
 // Converts a notification type to a real model type.  Returns true
 // iff |notification_type| was the notification type of a real model
 // type and |model_type| was filled in.
-bool NotificationTypeToRealModelType(const std::string& notification_type,
-                                     ModelType* model_type);
+SYNC_EXPORT bool NotificationTypeToRealModelType(
+    const std::string& notification_type,
+    ModelType* model_type);
 
 // Returns true if |model_type| is a real datatype
 SYNC_EXPORT bool IsRealDataType(ModelType model_type);