Credential Manager: Pass the correct credential type to the embedder.

public/platform/WebFederatedCredential.h

Index: public/platform/WebFederatedCredential.h
diff --git a/public/platform/WebFederatedCredential.h b/public/platform/WebFederatedCredential.h
index 69dafdd85090cfe7df651d5e65db56e87db66b1d..c6f40eeb1901a83047b6435283a1ca4712fd1fda 100644
--- a/public/platform/WebFederatedCredential.h
+++ b/public/platform/WebFederatedCredential.h
@@ -12,15 +12,20 @@
 
 namespace blink {
 
+class PlatformFederatedCredential;
+
 class WebFederatedCredential : public WebCredential {
 public:
     BLINK_PLATFORM_EXPORT WebFederatedCredential(const WebString& id, const WebString& name, const WebURL& avatarURL, const WebURL& federation);
 
     BLINK_PLATFORM_EXPORT void assign(const WebFederatedCredential&);
 
-    BLINK_PLATFORM_EXPORT virtual bool isFederatedCredential() const override { return true; }
-
     BLINK_PLATFORM_EXPORT WebURL federation() const;
+
+#if INSIDE_BLINK
+    BLINK_PLATFORM_EXPORT WebFederatedCredential(PlatformCredential*);
+    BLINK_PLATFORM_EXPORT WebFederatedCredential& operator=(PlatformCredential*);
+#endif
 };
 
 } // namespace blink