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

chrome/browser/first_run/first_run_posix.cc

Index: chrome/browser/first_run/first_run_posix.cc
diff --git a/chrome/browser/first_run/first_run_posix.cc b/chrome/browser/first_run/first_run_posix.cc
index 09cbc9c2be3589fc19057d73e7119c3deabe0ec4..4b3fae112e237b41d9b2c25464ccdfebdaf0ce30 100644
--- a/chrome/browser/first_run/first_run_posix.cc
+++ b/chrome/browser/first_run/first_run_posix.cc
@@ -95,8 +95,10 @@ bool ImportSettings(Profile* 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());