Fix chromium-os:10777 and other sync related crashes.

chrome/browser/dom_ui/options/sync_options_handler.cc

 // Copyright (c) 2010 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/dom_ui/options/sync_options_handler.h"
 
 #include "app/l10n_util.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/stl_util-inl.h"
@@ skipping 41 matching lines @@
   localized_strings->SetString("syncthemes",
       l10n_util::GetStringUTF16(IDS_SYNC_DATATYPE_THEMES));
   localized_strings->SetString("syncapps",
       l10n_util::GetStringUTF16(IDS_SYNC_DATATYPE_APPS));
   localized_strings->SetString("syncsessions",
       l10n_util::GetStringUTF16(IDS_SYNC_DATATYPE_SESSIONS));
 }
 
 void SyncOptionsHandler::Initialize() {
   ProfileSyncService* service =
-      dom_ui_->GetProfile()->GetOriginalProfile()->GetProfileSyncService();
-  // If service is unavailable for some good reason, 'IsEnabled()' method
-  // should return false. Otherwise something is broken.
-  DCHECK(service);
+      dom_ui_->GetProfile()->GetProfileSyncService();
+  if (!service)
+    return;  // Can happen in ChromeOS if called before login.
 
   DictionaryValue args;
   SyncSetupFlow::GetArgsForConfigure(service, &args);
 
   dom_ui_->CallJavascriptFunction(
       L"PersonalOptions.setRegisteredDataTypes", args);
 }
 
 void SyncOptionsHandler::RegisterMessages() {
   dom_ui_->RegisterMessageCallback("updatePreferredDataTypes",
       NewCallback(this, &SyncOptionsHandler::OnPreferredDataTypesUpdated));
 }
 
 void SyncOptionsHandler::OnPreferredDataTypesUpdated(const ListValue* args) {
   NotificationService::current()->Notify(
       NotificationType::SYNC_DATA_TYPES_UPDATED,
       Source<Profile>(dom_ui_->GetProfile()),
       NotificationService::NoDetails());
 }