Add missing calls to ScriptWrappable::init in FontFace, LocalCredential and FederatedCredential.

Source/modules/credentialmanager/FederatedCredential.cpp

 // 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.
 
 #include "config.h"
 #include "modules/credentialmanager/FederatedCredential.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "platform/credentialmanager/PlatformFederatedCredential.h"
 
 namespace blink {
 
 FederatedCredential* FederatedCredential::create(const String& id, const String& name, const String& avatar, const String& federation, ExceptionState& exceptionState)
 {
     KURL avatarURL = parseStringAsURL(avatar, exceptionState);
     KURL federationURL = parseStringAsURL(federation, exceptionState);
     if (exceptionState.hadException())
         return nullptr;
     return new FederatedCredential(id, name, avatarURL, federationURL);
 }
 
 FederatedCredential::FederatedCredential(const String& id, const String& name, const KURL& avatar, const KURL& federation)
     : Credential(PlatformFederatedCredential::create(id, name, avatar, federation))
 {
+    ScriptWrappable::init(this);
 }
 
 const KURL& FederatedCredential::federation() const
 {
     return static_cast<PlatformFederatedCredential*>(m_platformCredential.get())->federation();
 }
 
 } // namespace blink