Port messages sent by WebIDBFactoryImpl to Mojo.

content/child/indexed_db/webidbdatabase_impl.h

Index: content/child/indexed_db/webidbdatabase_impl.h
diff --git a/content/child/indexed_db/webidbdatabase_impl.h b/content/child/indexed_db/webidbdatabase_impl.h
index f25677d2732cbb14c8555b4f60e0757f796ed755..a348a4da24e8ddf93bfb25ba59752253bb2409bb 100644
--- a/content/child/indexed_db/webidbdatabase_impl.h
+++ b/content/child/indexed_db/webidbdatabase_impl.h
@@ -28,7 +28,6 @@ class ThreadSafeSender;
 class WebIDBDatabaseImpl : public blink::WebIDBDatabase {
  public:
   WebIDBDatabaseImpl(int32_t ipc_database_id,
-                     int32_t ipc_database_callbacks_id,
                      ThreadSafeSender* thread_safe_sender);
   ~WebIDBDatabaseImpl() override;
 
@@ -126,7 +125,6 @@ class WebIDBDatabaseImpl : public blink::WebIDBDatabase {
 
  private:
   int32_t ipc_database_id_;
-  int32_t ipc_database_callbacks_id_;
   std::set<int32_t> observer_ids_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 };