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

chrome/browser/importer/importer.cc

 // Copyright (c) 2006-2008 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/importer.h"
 
 #include <map>
 #include <set>
 
 #include "app/gfx/favicon_size.h"
@@ skipping 510 matching lines @@
 void ImporterHost::StartImportSettings(const ProfileInfo& profile_info,
                                        Profile* target_profile,
                                        uint16 items,
                                        ProfileWriter* writer,
                                        bool first_run) {
   // Preserves the observer and creates a task, since we do async import
   // so that it doesn't block the UI. When the import is complete, observer
   // 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;
   if (target_profile && target_profile->GetBookmarkModel()->IsLoaded()) {
     std::vector<GURL> starred_urls;
     target_profile->GetBookmarkModel()->GetBookmarks(&starred_urls);
     import_to_bookmark_bar = (starred_urls.size() == 0);
   }
   importer_->set_import_to_bookmark_bar(import_to_bookmark_bar);
   task_ = NewRunnableMethod(importer_, &Importer::StartImport,
@@ skipping 290 matching lines @@
   // TODO(jeremy):Check that Safari folder is in fact present.
   ProfileInfo* safari = new ProfileInfo();
   safari->browser_type = SAFARI;
   safari->description = l10n_util::GetString(IDS_IMPORT_FROM_SAFARI);
   safari->source_path.clear();
   safari->app_path.clear();
   safari->services_supported = HISTORY | FAVORITES | HOME_PAGE;
   source_profiles_.push_back(safari);
 }
 #endif  // OS_MACOSX