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

chrome/browser/banners/app_banner_manager.cc

Index: chrome/browser/banners/app_banner_manager.cc
diff --git a/chrome/browser/banners/app_banner_manager.cc b/chrome/browser/banners/app_banner_manager.cc
index 156fa02630171a6a0357bb448a9b237a920c81f5..36463cff7cd8c2d1c1b8b966e0d5fe81391bd6ca 100644
--- a/chrome/browser/banners/app_banner_manager.cc
+++ b/chrome/browser/banners/app_banner_manager.cc
@@ -7,7 +7,6 @@
 #include <algorithm>
 
 #include "base/bind.h"
-#include "base/callback.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
@@ -140,11 +139,6 @@ void AppBannerManager::SendBannerDismissed(int request_id) {
   event_->BannerDismissed();
 }
 
-base::Closure AppBannerManager::FetchWebappSplashScreenImageCallback(
-    const std::string& webapp_id) {
-  return base::Closure();
-}
-
 AppBannerManager::AppBannerManager(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       SiteEngagementObserver(nullptr),