Improve WebstoreInstaller error handling.

chrome/browser/ui/intents/web_intent_picker_controller.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/ui/intents/web_intent_picker_controller.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 258 matching lines @@
 }
 
 void WebIntentPickerController::OnInlineDispositionWebContentsCreated(
     content::WebContents* web_contents) {
   if (web_contents)
     intents_dispatcher_->DispatchIntent(web_contents);
 }
 
 void WebIntentPickerController::OnExtensionInstallRequested(
     const std::string& id) {
-  webstore_installer_ = new WebstoreInstaller(
+  scoped_refptr<WebstoreInstaller> installer = new WebstoreInstaller(
       wrapper_->profile(), this, &wrapper_->web_contents()->GetController(), id,
       WebstoreInstaller::FLAG_INLINE_INSTALL);
 
   pending_async_count_++;
-  webstore_installer_->Start();
+  installer->Start();
 }
 
 void WebIntentPickerController::OnCancelled() {
   if (!intents_dispatcher_)
     return;
 
   if (service_tab_) {
     intents_dispatcher_->SendReplyMessage(
         webkit_glue::WEB_INTENT_SERVICE_TAB_CLOSED, string16());
   } else {
@@ skipping 232 matching lines @@
   if (--pending_async_count_ == 0) {
     picker_->OnPendingAsyncCompleted();
   }
 }
 
 void WebIntentPickerController::ClosePicker() {
   if (picker_) {
     picker_->Close();
   }
 }