Fail gracefully if profile Temp dir can not be accessed.

chrome/browser/extensions/crx_installer.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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/crx_installer.h"
 
 #include <set>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/file_util.h"
@@ skipping 98 matching lines @@
   }
 
   // Make sure the UI is deleted on the ui thread.
   BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, client_);
   client_ = NULL;
 }
 
 void CrxInstaller::InstallCrx(const FilePath& source_file) {
   source_file_ = source_file;
 
-  FilePath user_data_temp_dir;
-  {
-    // We shouldn't be doing disk IO on the UI thread.
-    //   http://code.google.com/p/chromium/issues/detail?id=60634
-    base::ThreadRestrictions::ScopedAllowIO allow_io;
-    CHECK(PathService::Get(chrome::DIR_USER_DATA_TEMP, &user_data_temp_dir));
-  }
-
   scoped_refptr<SandboxedExtensionUnpacker> unpacker(
       new SandboxedExtensionUnpacker(
           source_file,
-          user_data_temp_dir,
           g_browser_process->resource_dispatcher_host(),
           this));
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(
           unpacker.get(), &SandboxedExtensionUnpacker::Start));
 }
 
 void CrxInstaller::InstallUserScript(const FilePath& source_file,
@@ skipping 291 matching lines @@
     client_->OnInstallSuccess(extension_.get(), install_icon_.get());
 
   // Tell the frontend about the installation and hand off ownership of
   // extension_ to it.
   frontend_->OnExtensionInstalled(extension_);
   extension_ = NULL;
 
   // We're done. We don't post any more tasks to ourselves so we are deleted
   // soon.
 }