[Refactor] Remove AppBannerManager::app_title_

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 d60e013bc216402d065ec97ab526b5f66640a69c..9e9e0b777373ac64b2b9e0630922cb0d3dd5df1e 100644
--- a/chrome/browser/banners/app_banner_manager.cc
+++ b/chrome/browser/banners/app_banner_manager.cc
@@ -222,13 +222,6 @@ void AppBannerManager::OnDidGetManifest(const InstallableData& data) {
   manifest_url_ = data.manifest_url;
   manifest_ = data.manifest;
 
-  // One of manifest_.name or manifest_.short_name must be non-null and
-  // non-empty if the error code was NO_ERROR_DETECTED.
-  if (manifest_.name.is_null() || manifest_.name.string().empty())
-    app_title_ = manifest_.short_name.string();
-  else
-    app_title_ = manifest_.name.string();
-
   PerformInstallableCheck();
 }