Don't crash when trying to create an ExtensionSyncData from invalid SyncData.

chrome/browser/extensions/app_sync_bundle.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/extensions/app_sync_bundle.h"
 
 #include "base/location.h"
 #include "chrome/browser/extensions/extension_sync_service.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 15 matching lines @@
 void AppSyncBundle::SetupSync(
     syncer::SyncChangeProcessor* sync_change_processor,
     syncer::SyncErrorFactory* sync_error_factory,
     const syncer::SyncDataList& initial_sync_data) {
   sync_processor_.reset(sync_change_processor);
   sync_error_factory_.reset(sync_error_factory);
 
   for (syncer::SyncDataList::const_iterator i = initial_sync_data.begin();
        i != initial_sync_data.end();
        ++i) {
-    AppSyncData app_sync_data(*i);
-    AddApp(app_sync_data.id());
-    extension_sync_service_->ProcessAppSyncData(app_sync_data);
+    scoped_ptr<AppSyncData> app_sync_data(AppSyncData::CreateFromSyncData(*i));
+    if (app_sync_data.get()) {
+      AddApp(app_sync_data->id());
+      extension_sync_service_->ProcessAppSyncData(*app_sync_data);
+    }
   }
 }
 
 void AppSyncBundle::Reset() {
   sync_processor_.reset();
   sync_error_factory_.reset();
   synced_apps_.clear();
   pending_sync_data_.clear();
 }
 
@@ skipping 119 matching lines @@
 }
 
 
 void AppSyncBundle::MarkPendingAppSynced(const std::string& id) {
   pending_sync_data_.erase(id);
   synced_apps_.insert(id);
 }
 
 
 }  // namespace extensions