Fix failures from GDataFileSystemTest unit tests

chrome/browser/chromeos/gdata/gdata_file_system_unittest.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 <errno.h>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 81 matching lines @@
 };
 
 }  // anonymous namespace
 
 namespace gdata {
 
 class GDataFileSystemTest : public testing::Test {
  protected:
   GDataFileSystemTest()
       : ui_thread_(content::BrowserThread::UI, &message_loop_),
+        file_thread_(content::BrowserThread::FILE),
         io_thread_(content::BrowserThread::IO, &message_loop_),
-        file_thread_(content::BrowserThread::FILE),
         file_system_(NULL),
         mock_doc_service_(NULL),
         mock_sync_client_(NULL),
         num_callback_invocations_(0),
         expected_error_(base::PLATFORM_FILE_OK),
         expected_cache_state_(0),
         expected_sub_dir_type_(GDataRootDirectory::CACHE_TYPE_META),
         expected_file_(NULL),
         expect_outgoing_symlink_(false) {
   }
@@ skipping 654 matching lines @@
 
     base::PlatformFileError last_error_;
     FilePath download_path_;
     std::string mime_type_;
     GDataFileType file_type_;
     int quota_bytes_total_;
     int quota_bytes_used_;
   };
 
   MessageLoopForUI message_loop_;
+  // The order of the test threads is important, do not change the order.
+  // See also content/browser/browser_thread_imple.cc.
   content::TestBrowserThread ui_thread_;
+  content::TestBrowserThread file_thread_;
   content::TestBrowserThread io_thread_;
-  content::TestBrowserThread file_thread_;
   scoped_ptr<TestingProfile> profile_;
   scoped_refptr<CallbackHelper> callback_helper_;
   GDataFileSystem* file_system_;
   MockDocumentsService* mock_doc_service_;
   scoped_ptr<MockGDataSyncClient> mock_sync_client_;
 
   int num_callback_invocations_;
   base::PlatformFileError expected_error_;
   int expected_cache_state_;
   GDataRootDirectory::CacheSubDirectoryType expected_sub_dir_type_;
@@ skipping 1552 matching lines @@
 
   // Verify account meta feed is saved to cache.
   RunAllPendingForIO();
   FilePath path = file_system_->cache_paths_[
       GDataRootDirectory::CACHE_TYPE_META].Append(
           FILE_PATH_LITERAL("account_metadata.json"));
   EXPECT_TRUE(file_util::PathExists(path));
 }
 
 }   // namespace gdata