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

public/platform/WebFederatedCredential.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebFederatedCredential_h
 #define WebFederatedCredential_h
 
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebCredential.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
 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;
 
-    BLINK_PLATFORM_EXPORT WebURL federation() const;
+#if INSIDE_BLINK
+    BLINK_PLATFORM_EXPORT WebFederatedCredential(PlatformCredential*);
+    BLINK_PLATFORM_EXPORT WebFederatedCredential& operator=(PlatformCredential*);
+#endif
 };
 
 } // namespace blink
 
 #endif // WebFederatedCredential_h