Introduce a stable set of errors for inline install

chrome/browser/ui/app_list/search/webstore/webstore_result.cc

Index: chrome/browser/ui/app_list/search/webstore/webstore_result.cc
diff --git a/chrome/browser/ui/app_list/search/webstore/webstore_result.cc b/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
index 50dea34a92b0e08943f2aa622feaf3130c7ade8b..ef45250e2be89879303593efdb7de89c825f5cbf 100644
--- a/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
+++ b/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
@@ -199,7 +199,10 @@ void WebstoreResult::StartInstall(bool launch_ephemeral_app) {
   installer->BeginInstall();
 }
 
-void WebstoreResult::InstallCallback(bool success, const std::string& error) {
+void WebstoreResult::InstallCallback(
+    bool success,
+    const std::string& error,
+    extensions::webstore_install::Result result) {
   if (!success) {
     LOG(ERROR) << "Failed to install app, error=" << error;
     SetIsInstalling(false);