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

chrome/test/chromedriver/window_commands.cc

Index: chrome/test/chromedriver/window_commands.cc
diff --git a/chrome/test/chromedriver/window_commands.cc b/chrome/test/chromedriver/window_commands.cc
index 93a36f6fd934da28438111957918716450d7ebfc..5aa83bc117b884ec0f2e9ee954f21a1336c245c2 100644
--- a/chrome/test/chromedriver/window_commands.cc
+++ b/chrome/test/chromedriver/window_commands.cc
@@ -349,7 +349,7 @@ Status ExecuteSwitchToFrame(Session* session,
   if (!params.Get("id", &id))
     return Status(kUnknownError, "missing 'id'");
 
-  if (id->IsType(base::Value::TYPE_NULL)) {
+  if (id->IsType(base::Value::Type::NONE)) {
     session->SwitchToTopFrame();
     return Status(kOk);
   }