Fix ShelfSpinnerController DCHECK controller is null when Killed

Second attempt to fix - see crrev.com/c/2408595

Bug: 1077722
Change-Id: Iab4baf26ce1c477bfa7d023a65e2cdbf2956911a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2452031
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814447}

chrome/browser/ui/ash/launcher/shelf_spinner_controller.cc

@@ -224,7 +224,7 @@ bool ShelfSpinnerController::RemoveSpinnerFromControllerMap(
 
   const ash::ShelfID shelf_id(app_id);
   DCHECK_EQ(it->second.controller(),
-            it->second.IsFinished()
+            it->second.IsKilled()
                 ? nullptr
                 : owner_->shelf_model()->GetShelfItemDelegate(shelf_id));
   app_controller_map_.erase(it);