[ios] Use URLInfo instead of NSURL in tab grid drop

URLs dragged from bookmarks are wrapped in URLInfo,
so drops onto the tab grid must unwrap URLInfo.

Change-Id: I8c1eb8b4e3c8b9b8222473313919066fb659e7e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436521
Commit-Queue: edchin <edchin@chromium.org>
Auto-Submit: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811846}

ios/chrome/browser/ui/tab_grid/tab_grid_mediator.mm

@@ -459,10 +459,9 @@ web::WebState* GetWebStateWithId(WebStateList* web_state_list,
   }
 
   // Handle URLs from within Chrome synchronously using a local object.
-  if ([dragItem.localObject isKindOfClass:[NSURL class]]) {
-    NSURL* droppedURL = static_cast<NSURL*>(dragItem.localObject);
-    [self insertNewItemAtIndex:destinationIndex
-                       withURL:net::GURLWithNSURL(droppedURL)];
+  if ([dragItem.localObject isKindOfClass:[URLInfo class]]) {
+    URLInfo* droppedURL = static_cast<URLInfo*>(dragItem.localObject);
+    [self insertNewItemAtIndex:destinationIndex withURL:droppedURL.URL];
     return;
   }
 }