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

chrome/browser/prefs/tracked/pref_hash_browsertest.cc

Index: chrome/browser/prefs/tracked/pref_hash_browsertest.cc
diff --git a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
index f77616a6b84ab5faa574b096939d1e39677681e3..ea7def8a20754fcb2046710015bcbb40b3ca4151 100644
--- a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
@@ -117,7 +117,7 @@ std::unique_ptr<base::DictionaryValue> ReadPrefsDictionary(
     ADD_FAILURE() << "Error #" << error_code << ": " << error_str;
     return std::unique_ptr<base::DictionaryValue>();
   }
-  if (!prefs->IsType(base::Value::TYPE_DICTIONARY)) {
+  if (!prefs->IsType(base::Value::Type::DICTIONARY)) {
     ADD_FAILURE();
     return std::unique_ptr<base::DictionaryValue>();
   }