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

chrome/browser/extensions/extension_disabled_ui_browsertest.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 "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 220 matching lines @@
       "http://localhost/autoupdate/updates.xml");
   specifics.mutable_extension()->set_version("2");
   syncer::SyncData sync_data =
       syncer::SyncData::CreateRemoteData(1234567,
                                          specifics,
                                          base::Time::Now(),
                                          syncer::AttachmentIdList(),
                                          syncer::AttachmentServiceProxy());
   // Sync is installing a new extension, so it pends.
   EXPECT_FALSE(sync_service->ProcessExtensionSyncData(
-      extensions::ExtensionSyncData(sync_data)));
+      *extensions::ExtensionSyncData::CreateFromSyncData(sync_data)));
 
   WaitForExtensionInstall();
   content::RunAllBlockingPoolTasksUntilIdle();
 
   const Extension* extension = service_->GetExtensionById(extension_id, true);
   ASSERT_TRUE(extension);
   EXPECT_EQ("2", extension->VersionString());
   EXPECT_EQ(1u, registry_->disabled_extensions().size());
   EXPECT_EQ(Extension::DISABLE_REMOTE_INSTALL,
             ExtensionPrefs::Get(service_->profile())
                 ->GetDisableReasons(extension_id));
   EXPECT_TRUE(GetExtensionDisabledGlobalError());
 }