Credential manager: Convert strings to URLs early.

Source/platform/credentialmanager/PlatformCredential.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 "platform/credentialmanager/PlatformCredential.h"
 
 namespace blink {
 
-PlatformCredential* PlatformCredential::create(const String& id, const String& name, const String& avatarURL)
+PlatformCredential* PlatformCredential::create(const String& id, const String& name, const KURL& avatarURL)
 {
     return new PlatformCredential(id, name, avatarURL);
 }
 
-PlatformCredential::PlatformCredential(const String& id, const String& name, const String& avatarURL)
+PlatformCredential::PlatformCredential(const String& id, const String& name, const KURL& avatarURL)
     : m_id(id)
     , m_name(name)
     , m_avatarURL(avatarURL)
 {
 }
 
 PlatformCredential::~PlatformCredential()
 {
 }
 
 } // namespace blink