CREDENTIAL: Extend FormData opacity to created Request objects

Source/core/html/DOMFormData.h

Index: Source/core/html/DOMFormData.h
diff --git a/Source/core/html/DOMFormData.h b/Source/core/html/DOMFormData.h
index bb9d64455ed00d268c93feb950c035d43a556eef..ff3d2aa18ccc09f2ae7782ecae5d58e37981f993 100644
--- a/Source/core/html/DOMFormData.h
+++ b/Source/core/html/DOMFormData.h
@@ -75,6 +75,7 @@ public:
     void set(const String& name, Blob*, const String& filename = String());
 
     void makeOpaque() { m_opaque = true; }
+    bool opaque() const { return m_opaque; }
 
 private:
     explicit DOMFormData(const WTF::TextEncoding&);