Reland: Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/prefs/session_startup_pref.cc

Index: chrome/browser/prefs/session_startup_pref.cc
diff --git a/chrome/browser/prefs/session_startup_pref.cc b/chrome/browser/prefs/session_startup_pref.cc
index b7dd90f45765b50a944b4e4552eb53d5a55c807c..9126203deeba9a3b95501a654cc9d16baccc036e 100644
--- a/chrome/browser/prefs/session_startup_pref.cc
+++ b/chrome/browser/prefs/session_startup_pref.cc
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
@@ -90,7 +91,7 @@ void SessionStartupPref::SetStartupPref(PrefService* prefs,
     url_pref_list->Clear();
     for (size_t i = 0; i < pref.urls.size(); ++i) {
       url_pref_list->Set(static_cast<int>(i),
-                         new base::Value(pref.urls[i].spec()));
+                         base::MakeUnique<base::Value>(pref.urls[i].spec()));
     }
   }
 }