Run ShortcutHelper::AddToLauncherInBackgroundWithSkBitmap() on Worker thread instead of IO thread

chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc

Index: chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc
diff --git a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc
index 709b6ef595f9d95d8651a340c63cb7abd1ce7490..997b3f1c8476b5f322ad51d4b4d0d4300114c012 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc
+++ b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.cc
@@ -127,11 +127,9 @@ void AddToHomescreenDialogHelper::AddShortcut(const ShortcutInfo& info,
   RecordAddToHomescreen();
 
   const std::string& uid = base::GenerateGUID();
-  content::BrowserThread::PostTask(
-      content::BrowserThread::IO, FROM_HERE,
-      base::Bind(&ShortcutHelper::AddToLauncherInBackgroundWithSkBitmap,
-                 web_contents->GetBrowserContext(), info, uid, icon,
-                 data_fetcher_->FetchSplashScreenImageCallback(uid)));
+  ShortcutHelper::AddToLauncherWithSkBitmap(
+      web_contents->GetBrowserContext(), info, uid, icon,
+      data_fetcher_->FetchSplashScreenImageCallback(uid));
 }
 
 bool AddToHomescreenDialogHelper::RegisterAddToHomescreenDialogHelper(