Fix crash during import by checking for errors and exiting early.

chrome/browser/importer/importer.cc

Index: chrome/browser/importer/importer.cc
diff --git a/chrome/browser/importer/importer.cc b/chrome/browser/importer/importer.cc
index 7e3ad0f2d5ff2a15502ae07ce26914f3fef708f9..ab02a416b6a61fa58cbe9298e3cc1f8f37a59626 100644
--- a/chrome/browser/importer/importer.cc
+++ b/chrome/browser/importer/importer.cc
@@ -528,6 +528,12 @@ void ImporterHost::StartImportSettings(const ProfileInfo& profile_info,
   // will be notified.
   writer_ = writer;
   importer_ = CreateImporterByType(profile_info.browser_type);
+  // If we fail to create Importer, exit as we can not do anything.
+  if (!importer_) {
+    ImportEnded();
+    return;
+  }
+
   importer_->AddRef();
 
   bool import_to_bookmark_bar = first_run;