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

chrome/browser/apps/ephemeral_app_browsertest.cc

Index: chrome/browser/apps/ephemeral_app_browsertest.cc
diff --git a/chrome/browser/apps/ephemeral_app_browsertest.cc b/chrome/browser/apps/ephemeral_app_browsertest.cc
index fd1d298e93e56c4753f68fe4497c4f9fbe0337ae..348a125b8ec5b91945d7bd9a066cf84209897d06 100644
--- a/chrome/browser/apps/ephemeral_app_browsertest.cc
+++ b/chrome/browser/apps/ephemeral_app_browsertest.cc
@@ -533,8 +533,8 @@ class EphemeralAppBrowserTest : public EphemeralAppTestBase {
     for (syncer::SyncChangeList::iterator it =
              mock_sync_processor_.changes().begin();
          it != mock_sync_processor_.changes().end(); ++it) {
-      scoped_ptr<AppSyncData> data(new AppSyncData(*it));
-      if (data->id() == id)
+      scoped_ptr<AppSyncData> data(AppSyncData::CreateFromSyncChange(*it));
+      if (data.get() && data->id() == id)
         sync_data.reset(data.release());
     }