Make base::Value::TYPE a scoped enum.

services/preferences/public/cpp/tests/pref_observer_store_unittest.cc

Index: services/preferences/public/cpp/tests/pref_observer_store_unittest.cc
diff --git a/services/preferences/public/cpp/tests/pref_observer_store_unittest.cc b/services/preferences/public/cpp/tests/pref_observer_store_unittest.cc
index b1fcb0453fa207ccaa39e270c8df4fddc8b50454..d18cfbe75cf953f9656202ab7a40c303d99a572d 100644
--- a/services/preferences/public/cpp/tests/pref_observer_store_unittest.cc
+++ b/services/preferences/public/cpp/tests/pref_observer_store_unittest.cc
@@ -267,7 +267,7 @@ TEST_F(PrefObserverStoreTest, WriteToNestedPrefs) {
   // Change an item within the nested dictionary
   base::Value* result = nullptr;
   store()->GetMutableValue(key1, &result);
-  EXPECT_EQ(base::Value::TYPE_DICTIONARY, result->GetType());
+  EXPECT_EQ(base::Value::Type::DICTIONARY, result->GetType());
   EXPECT_TRUE(result->Equals(&sub_dictionary1));
 
   base::DictionaryValue* dictionary_result = nullptr;