Credential Manager: Align 'FederatedCredential' with the spec.

Source/platform/exported/WebFederatedCredential.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 "public/platform/WebFederatedCredential.h"
 
 #include "platform/credentialmanager/PlatformFederatedCredential.h"
 
 namespace blink {
-WebFederatedCredential::WebFederatedCredential(const WebString& id, const WebURL& federation, const WebString& name, const WebURL& avatarURL)
-    : WebCredential(PlatformFederatedCredential::create(id, federation, name, avatarURL))
+WebFederatedCredential::WebFederatedCredential(const WebString& id, const WebURL& provider, const WebString& name, const WebURL& iconURL)
+    : WebCredential(PlatformFederatedCredential::create(id, provider, name, iconURL))
 {
 }
 
-// FIXME: Throw this away once it's unused on the Chromium side.
-WebFederatedCredential::WebFederatedCredential(const WebString& id, const WebString& name, const WebURL& avatarURL, const WebURL& federation)
-    : WebCredential(PlatformFederatedCredential::create(id, federation, name, avatarURL))
-{
-}
-
 void WebFederatedCredential::assign(const WebFederatedCredential& other)
 {
     m_platformCredential = other.m_platformCredential;
 }
 
-WebURL WebFederatedCredential::federation() const
+WebURL WebFederatedCredential::provider() const
 {
-    return static_cast<PlatformFederatedCredential*>(m_platformCredential.get())->federation();
+    return static_cast<PlatformFederatedCredential*>(m_platformCredential.get())->provider();
 }
 
 WebFederatedCredential::WebFederatedCredential(PlatformCredential* credential)
     : WebCredential(credential)
 {
 }
 
 WebFederatedCredential& WebFederatedCredential::operator=(PlatformCredential* credential)
 {
     m_platformCredential = credential;
     return *this;
 }
 
 } // namespace blink