Always destroy CrxInstaller on the UI Thread

chrome/browser/chromeos/app_mode/kiosk_app_data.cc

 // Copyright 2013 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/chromeos/app_mode/kiosk_app_data.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 74 matching lines @@
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // KioskAppData::CrxLoader
 // Loads meta data from crx file.
 
 class KioskAppData::CrxLoader : public extensions::SandboxedUnpackerClient {
  public:
   CrxLoader(const base::WeakPtr<KioskAppData>& client,
             const base::FilePath& crx_file)
-      : client_(client),
+      : SandboxedUnpackerClient(
+            content::BrowserThread::GetMessageLoopProxyForThread(
+                content::BrowserThread::UI)),
+        client_(client),
         crx_file_(crx_file),
-        success_(false) {
-  }
+        success_(false) {}
 
   void Start() {
     base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
     base::SequencedWorkerPool::SequenceToken token =
         pool->GetNamedSequenceToken("KioskAppData.CrxLoaderWorker");
     task_runner_ = pool->GetSequencedTaskRunnerWithShutdownBehavior(
         token,
         base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
     task_runner_->PostTask(FROM_HERE,
                            base::Bind(&CrxLoader::StartOnBlockingPool, this));
@@ skipping 545 matching lines @@
 
   SkBitmap icon = crx_loader->icon();
   if (icon.empty())
     icon = *extensions::util::GetDefaultAppIcon().bitmap();
   SetCache(crx_loader->name(), icon);
 
   SetStatus(STATUS_LOADED);
 }
 
 }  // namespace chromeos