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

chrome/browser/dom_ui/options/sync_options_handler.cc

Index: chrome/browser/dom_ui/options/sync_options_handler.cc
diff --git a/chrome/browser/dom_ui/options/sync_options_handler.cc b/chrome/browser/dom_ui/options/sync_options_handler.cc
index e67050c4fb9afb39742081fdb0aea50a3d9483d9..75bae5b61134a0fd0126fee2c83fb488335b7b36 100644
--- a/chrome/browser/dom_ui/options/sync_options_handler.cc
+++ b/chrome/browser/dom_ui/options/sync_options_handler.cc
@@ -59,10 +59,9 @@ void SyncOptionsHandler::GetLocalizedValues(
 
 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_->GetOriginalProfile()->GetProfileSyncService();
+  if (!service)
+    return;  // Can happen in ChromeOS if called before login.
 
   DictionaryValue args;
   SyncSetupFlow::GetArgsForConfigure(service, &args);