Make the ShortcutHelper toast instead of send the user home for web app banners

chrome/browser/android/shortcut_helper.h

Index: chrome/browser/android/shortcut_helper.h
diff --git a/chrome/browser/android/shortcut_helper.h b/chrome/browser/android/shortcut_helper.h
index 9b3074bf2ef4dcf429b8097c127a085940e1f738..6200c3c89875702ee877fb594bcef2f8e8463919 100644
--- a/chrome/browser/android/shortcut_helper.h
+++ b/chrome/browser/android/shortcut_helper.h
@@ -91,7 +91,8 @@ class ShortcutHelper : public content::WebContentsObserver {
   // Must be called from a WorkerPool task.
   static void AddShortcutInBackgroundWithSkBitmap(
       const ShortcutInfo& info,
-      const SkBitmap& icon_bitmap);
+      const SkBitmap& icon_bitmap,
+      const bool return_to_homescreen);
 
   // Registers JNI hooks.
   static bool RegisterShortcutHelper(JNIEnv* env);