Add deprecation warning banner to App Launcher on Mac.

chrome/browser/ui/app_list/app_list_view_delegate.h

Index: chrome/browser/ui/app_list/app_list_view_delegate.h
diff --git a/chrome/browser/ui/app_list/app_list_view_delegate.h b/chrome/browser/ui/app_list/app_list_view_delegate.h
index cb670a005c6b4a45e7d2bc1b2e8db354ecc6c671..4453257f602d19a400c65829e0e863051a5571f2 100644
--- a/chrome/browser/ui/app_list/app_list_view_delegate.h
+++ b/chrome/browser/ui/app_list/app_list_view_delegate.h
@@ -120,6 +120,15 @@ class AppListViewDelegate : public app_list::AppListViewDelegate,
   bool ShouldCenterWindow() const override;
   void AddObserver(app_list::AppListViewDelegateObserver* observer) override;
   void RemoveObserver(app_list::AppListViewDelegateObserver* observer) override;
+#if !defined(OS_CHROMEOS)
+  base::string16 GetMessageTitle() const override;
+  base::string16 GetMessageText(size_t* message_break) const override;
+  base::string16 GetAppsShortcutName() const override;
+  base::string16 GetLearnMoreText() const override;
+  base::string16 GetLearnMoreLink() const override;
+  gfx::ImageSkia* GetAppsIcon() const override;
+  void OpenLearnMoreLink() override;
+#endif
 
   // Overridden from TemplateURLServiceObserver:
   void OnTemplateURLServiceChanged() override;