Fail gracefully if profile Temp dir can not be accessed.

chrome/common/chrome_paths.h

-// Copyright (c) 2006-2010 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.
 
 #ifndef CHROME_COMMON_CHROME_PATHS_H__
 #define CHROME_COMMON_CHROME_PATHS_H__
 #pragma once
 
 #include "build/build_config.h"
 
 // This file declares path keys for the chrome module.  These can be used with
@@ skipping 16 matching lines @@
   DIR_INSPECTOR,                // Directory where web inspector is located.
   DIR_APP_DICTIONARIES,         // Directory where the global dictionaries are.
   DIR_USER_DOCUMENTS,           // Directory for a user's "My Documents".
   DIR_DEFAULT_DOWNLOADS_SAFE,   // Directory for a user's
                                 // "My Documents/Downloads".
   DIR_DEFAULT_DOWNLOADS,        // Directory for a user's downloads.
   DIR_USER_DATA_TEMP,           // A temp directory within DIR_USER_DATA.  Use
                                 // this when a temporary file or directory will
                                 // be moved into the profile, to avoid issues
                                 // moving across volumes.  See crbug.com/13044 .
+                                // Getting this path does not create it.  Users
+                                // should check that the path exists before
+                                // using it.
   DIR_INTERNAL_PLUGINS,         // Directory where internal plugins reside.
 #if !defined(OS_MACOSX) && defined(OS_POSIX)
   DIR_POLICY_FILES,             // Directory for system-wide read-only
                                 // policy files that allow sys-admins
                                 // to set policies for chrome. This directory
                                 // contains subdirectories.
 #endif
 #if defined(OS_MACOSX)
   DIR_MANAGED_PREFS,            // Directory that stores the managed prefs plist
                                 // files for the current user.
@@ skipping 29 matching lines @@
 
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 void RegisterPathProvider();
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_PATHS_H__