[Upboarding]: Move ProtoDb forward declaration to factory helper.

- Fix the potential broken when moving the project to components/.

Bug: 1074682
Change-Id: I1301e6e45facee1837e718f375bd4feb77ef5556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2168242Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763444}

chrome/browser/upboarding/query_tiles/tile_service_factory_helper.cc

@@ -14,7 +14,6 @@
 #include "chrome/browser/upboarding/query_tiles/internal/config.h"
 #include "chrome/browser/upboarding/query_tiles/internal/tile_manager.h"
 #include "chrome/browser/upboarding/query_tiles/internal/tile_service_impl.h"
-#include "chrome/browser/upboarding/query_tiles/internal/tile_store.h"
 #include "components/image_fetcher/core/image_fetcher_service.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/leveldb_proto/public/proto_database_provider.h"

chrome/browser/upboarding/query_tiles/tile_service_factory_helper.h

@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/files/file_path.h"
+#include "chrome/browser/upboarding/query_tiles/internal/tile_store.h"
 
 namespace leveldb_proto {
 class ProtoDatabaseProvider;