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

chrome/browser/banners/app_banner_manager.h

Index: chrome/browser/banners/app_banner_manager.h
diff --git a/chrome/browser/banners/app_banner_manager.h b/chrome/browser/banners/app_banner_manager.h
index e043913e38a07c3f7da23e1b58114e0c3a3f1e97..a16e4e336236b1e5d08dbc78794813f2279dd887 100644
--- a/chrome/browser/banners/app_banner_manager.h
+++ b/chrome/browser/banners/app_banner_manager.h
@@ -94,12 +94,6 @@ class AppBannerManager : public content::WebContentsObserver,
   // desktop platforms.
   virtual void OnAppIconFetched(const SkBitmap& bitmap) {}
 
-  // Overridden and passed through base::Bind on Android. Called after a web app
-  // banner was successfully used to add a web app to homescreen to kick off an
-  // asynchronous fetch of a splash screen icon. Not used on desktop platforms.
-  virtual base::Closure FetchWebappSplashScreenImageCallback(
-      const std::string& webapp_id);
-
  protected:
   explicit AppBannerManager(content::WebContents* web_contents);
   ~AppBannerManager() override;