Add support for pulling icons for OfflineItems

components/offline_items_collection/core/offline_item.cc

Index: components/offline_items_collection/core/offline_item.cc
diff --git a/components/offline_items_collection/core/offline_item.cc b/components/offline_items_collection/core/offline_item.cc
index 9506bcf7f8d010103ee16f2b1c02a1a50c5686d8..834938dc63ed2b2e56944721bce2ca757d6ae4cf 100644
--- a/components/offline_items_collection/core/offline_item.cc
+++ b/components/offline_items_collection/core/offline_item.cc
@@ -69,4 +69,9 @@ bool OfflineItem::operator==(const OfflineItem& offline_item) const {
          time_remaining_ms == offline_item.time_remaining_ms;
 }
 
+OfflineItemVisuals::OfflineItemVisuals() = default;
+OfflineItemVisuals::OfflineItemVisuals(const OfflineItemVisuals& other) =
+    default;
+OfflineItemVisuals::~OfflineItemVisuals() = default;
+
 }  // namespace offline_items_collection