Introduce a stable set of errors for inline install

chrome/browser/extensions/webstore_standalone_installer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/webstore_standalone_installer.h"
 
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
@@ skipping 69 matching lines @@
   if (webstore_data_fetcher_) {
     webstore_data_fetcher_.reset();
     Release();  // Matches the AddRef in BeginInstall.
   }
 }
 
 void WebstoreStandaloneInstaller::CompleteInstall(
     webstore_install::Result result,
     const std::string& error) {
   if (!callback_.is_null())
-    callback_.Run(result == webstore_install::SUCCESS, error);
+    callback_.Run(result == webstore_install::SUCCESS, error, result);
   Release();  // Matches the AddRef in BeginInstall.
 }
 
 void WebstoreStandaloneInstaller::ProceedWithInstallPrompt() {
   install_prompt_ = CreateInstallPrompt();
   if (install_prompt_) {
     ShowInstallUI();
     // Control flow finishes up in InstallUIProceed or InstallUIAbort.
   } else {
     InstallUIProceed();
@@ skipping 288 matching lines @@
 void WebstoreStandaloneInstaller::OnWebStoreDataFetcherDone() {
   // An instance of this class is passed in as a delegate for the
   // WebstoreInstallHelper, ExtensionInstallPrompt and WebstoreInstaller, and
   // therefore needs to remain alive until they are done. Clear the webstore
   // data fetcher to avoid calling Release in AbortInstall while any of these
   // operations are in progress.
   webstore_data_fetcher_.reset();
 }
 
 }  // namespace extensions