Fix Firefox data import for Mac....

chrome/browser/importer/firefox3_importer.cc

 // Copyright (c) 2010 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/importer/firefox3_importer.h"
 
 #include <set>
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 18 matching lines @@
 using importer::BOOKMARKS_HTML;
 using importer::FAVORITES;
 using importer::HISTORY;
 using importer::HOME_PAGE;
 using importer::PASSWORDS;
 using importer::ProfileInfo;
 using importer::SEARCH_ENGINES;
 using webkit_glue::PasswordForm;
 
 Firefox3Importer::Firefox3Importer() {
+#if defined(OS_LINUX)
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
-
   locale_ = g_browser_process->GetApplicationLocale();
+#endif
 }
 
 Firefox3Importer::~Firefox3Importer() {
 }
 
 void Firefox3Importer::StartImport(importer::ProfileInfo profile_info,
                                    uint16 items,
                                    ImporterBridge* bridge) {
+#if defined(OS_LINUX)
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
+#endif
   bridge_ = bridge;
   source_path_ = profile_info.source_path;
   app_path_ = profile_info.app_path;
 
   // The order here is important!
   bridge_->NotifyStarted();
   if ((items & importer::HOME_PAGE) && !cancelled())
     ImportHomepage();  // Doesn't have a UI item.
 
   // Note history should be imported before bookmarks because bookmark import
@@ skipping 487 matching lines @@
 
       if (!ReencodeFavicon(&data[0], data.size(), &usage.png_data))
         continue;  // Unable to decode.
 
       usage.urls = i->second;
       favicons->push_back(usage);
     }
     s.reset();
   }
 }