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

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index be233f65d512fd6ebe4e958db2c06235e3400dd5..0c34b95a980e87d9be95a1ffc05dda7353847add 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -968,7 +968,7 @@ void LayerImpl::AsValueInto(base::trace_event::TracedValue* state) const {
     base::JSONReader json_reader;
     std::unique_ptr<base::Value> debug_info_value(json_reader.ReadToValue(str));
 
-    if (debug_info_value->IsType(base::Value::TYPE_DICTIONARY)) {
+    if (debug_info_value->IsType(base::Value::Type::DICTIONARY)) {
       base::DictionaryValue* dictionary_value = nullptr;
       bool converted_to_dictionary =
           debug_info_value->GetAsDictionary(&dictionary_value);