remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/worker/worker_webkitplatformsupport_impl.h

 // Copyright (c) 2012 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 CONTENT_WORKER_WORKER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_WORKER_WORKER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/child/webkitplatformsupport_impl.h"
 #include "third_party/WebKit/public/platform/WebIDBFactory.h"
@@ skipping 35 matching lines @@
   virtual unsigned long long visitedLinkHash(const char* canonicalURL,
                                              size_t length);
   virtual bool isLinkVisited(unsigned long long linkHash);
   virtual WebKit::WebMessagePortChannel* createMessagePortChannel();
   virtual void setCookies(const WebKit::WebURL& url,
                           const WebKit::WebURL& first_party_for_cookies,
                           const WebKit::WebString& value);
   virtual WebKit::WebString cookies(
       const WebKit::WebURL& url,
       const WebKit::WebURL& first_party_for_cookies);
-  virtual void prefetchHostName(const WebKit::WebString&);
   virtual WebKit::WebString defaultLocale();
   virtual WebKit::WebStorageNamespace* createLocalStorageNamespace();
   virtual void dispatchStorageEvent(
       const WebKit::WebString& key, const WebKit::WebString& old_value,
       const WebKit::WebString& new_value, const WebKit::WebString& origin,
       const WebKit::WebURL& url, bool is_local_storage);
 
   virtual WebKit::Platform::FileHandle databaseOpenFile(
       const WebKit::WebString& vfs_file_name, int desired_flags);
   virtual int databaseDeleteFile(const WebKit::WebString& vfs_file_name,
@@ skipping 48 matching lines @@
   scoped_ptr<WebKit::WebIDBFactory> web_idb_factory_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<base::MessageLoopProxy> child_thread_loop_;
   scoped_refptr<IPC::SyncMessageFilter> sync_message_filter_;
   scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_WORKER_WORKER_WEBKITPLATFORMSUPPORT_IMPL_H_