Skip a first-run import on Mac when there is nothing left to import.

chrome/browser/first_run/first_run_posix.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 "chrome/browser/first_run/first_run.h"
 
 #include "base/path_service.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/first_run/first_run_internal.h"
@@ skipping 77 matching lines @@
 }
 
 bool ImportSettings(Profile* profile,
                     scoped_refptr<ImporterHost> importer_host,
                     scoped_refptr<ImporterList> importer_list,
                     int items_to_import) {
   const importer::SourceProfile& source_profile =
       importer_list->GetSourceProfileAt(0);
 
   // Ensure that importers aren't requested to import items that they do not
-  // support.
+  // support. If there is no overlap, skip.
   items_to_import &= source_profile.services_supported;
+  if (items_to_import == 0)
+    return true;
 
   scoped_ptr<ImportEndedObserver> observer(new ImportEndedObserver);
   importer_host->SetObserver(observer.get());
   importer_host->StartImportSettings(source_profile,
                                      profile,
                                      items_to_import,
                                      new ProfileWriter(profile),
                                      true);
   // If the import process has not errored out, block on it.
   if (!observer->ended()) {
@@ skipping 33 matching lines @@
 namespace first_run {
 
 // TODO(port): Import switches need to be ported to both Mac and Linux. Not all
 // import switches here are implemented for Linux. None are implemented for Mac
 // (as this function will not be called on Mac).
 int ImportNow(Profile* profile, const CommandLine& cmdline) {
   return internal::ImportBookmarkFromFileIfNeeded(profile, cmdline);
 }
 
 }  // namespace first_run