Adds NULL check in NotifySessionServiceOfRestoredTabs for

chrome/browser/sessions/session_restore.cc

Index: chrome/browser/sessions/session_restore.cc
diff --git a/chrome/browser/sessions/session_restore.cc b/chrome/browser/sessions/session_restore.cc
index 79fc1cb1a9156966457ce41665be1a280d1e7928..b1bc7e9d3a109b301a53830054c68d0f0102229b 100644
--- a/chrome/browser/sessions/session_restore.cc
+++ b/chrome/browser/sessions/session_restore.cc
@@ -953,6 +953,8 @@ class SessionRestoreImpl : public content::NotificationObserver {
   void NotifySessionServiceOfRestoredTabs(Browser* browser, int initial_count) {
     SessionService* session_service =
         SessionServiceFactory::GetForProfile(profile_);
+    if (!session_service)
+      return;
     for (int i = initial_count; i < browser->tab_count(); ++i)
       session_service->TabRestored(browser->GetTabContentsWrapperAt(i),
                                    browser->IsTabPinned(i));