Stop using deprecated v8::ObjectTemplate::NewInstance().

Fix nits in affected files.

Change-Id: I3a0363c9b7c28359fd1c7cea305e4f7705a228c2
Reviewed-on: https://pdfium-review.googlesource.com/41355
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/fxjs/cfxjse_value.h b/fxjs/cfxjse_value.h
index dd01843..f83ddc3 100644
--- a/fxjs/cfxjse_value.h
+++ b/fxjs/cfxjse_value.h
@@ -88,11 +88,11 @@
   friend class CFXJSE_Class;
   friend class CFXJSE_Context;
 
-  CFXJSE_Value();
-  CFXJSE_Value(const CFXJSE_Value&);
-  CFXJSE_Value& operator=(const CFXJSE_Value&);
+  CFXJSE_Value() = delete;
+  CFXJSE_Value(const CFXJSE_Value&) = delete;
+  CFXJSE_Value& operator=(const CFXJSE_Value&) = delete;
 
-  UnownedPtr<v8::Isolate> m_pIsolate;
+  UnownedPtr<v8::Isolate> const m_pIsolate;
   v8::Global<v8::Value> m_hValue;
 };