Add throbber and status text to WebBluetooth chooser UI on non-Mac desktops

chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm

Index: chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
index d97c3ef6c9a9dfc81d7e81932c19e97f658cc682..b1331c32a23dbc27880474fb5301aa2d9225e51a 100644
--- a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
+++ b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
@@ -50,6 +50,8 @@ class TableViewController : public ChooserController::Observer {
   void OnOptionsInitialized() override;
   void OnOptionAdded(size_t index) override;
   void OnOptionRemoved(size_t index) override;
+  void AdapterEnabled(bool enabled) override;
+  void SetRefreshing(bool refreshing) override;
 
   void UpdateTableView();
 
@@ -98,6 +100,10 @@ void TableViewController::OnOptionRemoved(size_t index) {
   UpdateTableView();
 }
 
+void TableViewController::AdapterEnabled(bool enabled) {}
+
+void TableViewController::SetRefreshing(bool refreshing) {}
+
 void TableViewController::UpdateTableView() {
   [table_view_ setEnabled:chooser_controller_->NumOptions() > 0];
   [table_view_ reloadData];