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

ios/web/public/web_state/web_state.h

Index: ios/web/public/web_state/web_state.h
diff --git a/ios/web/public/web_state/web_state.h b/ios/web/public/web_state/web_state.h
index 08819be722df8b83e3bd836ccf4311e7f4fe3700..9f923336159d6f578c9fc9fb8fd9d8c99dad8a30 100644
--- a/ios/web/public/web_state/web_state.h
+++ b/ios/web/public/web_state/web_state.h
@@ -141,7 +141,7 @@ class WebState : public base::SupportsUserData {
   // Runs JavaScript in the main frame's context. If a callback is provided, it
   // will be used to return the result, when the result is available or script
   // execution has failed due to an error.
-  // NOTE: Integer values will be returned as TYPE_DOUBLE because of underlying
+  // NOTE: Integer values will be returned as Type::DOUBLE because of underlying
   // library limitation.
   typedef base::Callback<void(const base::Value*)> JavaScriptResultCallback;
   virtual void ExecuteJavaScript(const base::string16& javascript) = 0;