[WebAPKs]: Reduce the parameters of ShortcutHelper::AddToLauncherWithSkBitmap()

chrome/browser/android/banners/app_banner_manager_android.h

Index: chrome/browser/android/banners/app_banner_manager_android.h
diff --git a/chrome/browser/android/banners/app_banner_manager_android.h b/chrome/browser/android/banners/app_banner_manager_android.h
index 92f8ce086dc6fcb570b6711926cf2b1088f019ca..4fcdeeff7b1e76fbd214f709d003a95301a9753f 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.h
+++ b/chrome/browser/android/banners/app_banner_manager_android.h
@@ -56,11 +56,6 @@ class AppBannerManagerAndroid
   // AppBannerManager overrides.
   void RequestAppBanner(const GURL& validated_url, bool is_debug_mode) override;
 
-  // Returns a callback which fetches the splash screen image and stores it in
-  // a WebappDataStorage.
-  base::Closure FetchWebappSplashScreenImageCallback(
-      const std::string& webapp_id) override;
-
   // Registers native methods.
   static bool Register(JNIEnv* env);