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

chromeos/network/network_state_unittest.cc

Index: chromeos/network/network_state_unittest.cc
diff --git a/chromeos/network/network_state_unittest.cc b/chromeos/network/network_state_unittest.cc
index bea0c852086bcfc720b469e49099277435f0a333..6cd28ae6adf866d55b843c921a56f0ec6f78d86d 100644
--- a/chromeos/network/network_state_unittest.cc
+++ b/chromeos/network/network_state_unittest.cc
@@ -25,9 +25,7 @@ namespace {
 class TestStringValue : public base::Value {
  public:
   explicit TestStringValue(const std::string& in_value)
-      : base::Value(TYPE_STRING),
-        value_(in_value) {
-  }
+      : base::Value(Type::STRING), value_(in_value) {}
 
   ~TestStringValue() override {}