Remove deprecated ListValue::Append(Value*) overload on Linux.

chrome/browser/media_galleries/media_galleries_preferences.cc

Index: chrome/browser/media_galleries/media_galleries_preferences.cc
diff --git a/chrome/browser/media_galleries/media_galleries_preferences.cc b/chrome/browser/media_galleries/media_galleries_preferences.cc
index bb6aeb49b28b47250f8cd8013b8d639b1a34eecf..a32a4bb5f0cc09c8c8802e3d010103c21a8d2052 100644
--- a/chrome/browser/media_galleries/media_galleries_preferences.cc
+++ b/chrome/browser/media_galleries/media_galleries_preferences.cc
@@ -13,6 +13,7 @@
 #include "base/callback.h"
 #include "base/i18n/time_formatting.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/stl_util.h"
 #include "base/strings/string16.h"
@@ -284,9 +285,9 @@ bool PopulateGalleryPrefInfoFromDictionary(
   return true;
 }
 
-base::DictionaryValue* CreateGalleryPrefInfoDictionary(
+std::unique_ptr<base::DictionaryValue> CreateGalleryPrefInfoDictionary(
     const MediaGalleryPrefInfo& gallery) {
-  base::DictionaryValue* dict = new base::DictionaryValue();
+  auto dict = base::MakeUnique<base::DictionaryValue>();
   dict->SetString(kMediaGalleriesPrefIdKey,
                   base::Uint64ToString(gallery.pref_id));
   dict->SetString(kMediaGalleriesDeviceIdKey, gallery.device_id);