remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/renderer/renderer_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_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
@@ skipping 49 matching lines @@
   virtual WebKit::WebCookieJar* cookieJar();
   virtual WebKit::WebHyphenator* hyphenator();
   virtual WebKit::WebThemeEngine* themeEngine();
   virtual WebKit::WebSpeechSynthesizer* createSpeechSynthesizer(
       WebKit::WebSpeechSynthesizerClient* client);
   virtual bool sandboxEnabled();
   virtual unsigned long long visitedLinkHash(
       const char* canonicalURL, size_t length);
   virtual bool isLinkVisited(unsigned long long linkHash);
   virtual WebKit::WebMessagePortChannel* createMessagePortChannel();
-  virtual void prefetchHostName(const WebKit::WebString&);
   virtual WebKit::WebPrescientNetworking* prescientNetworking();
   virtual void cacheMetadata(
       const WebKit::WebURL&, double, const char*, size_t);
   virtual WebKit::WebString defaultLocale();
   virtual void suddenTerminationChanged(bool enabled);
   virtual WebKit::WebStorageNamespace* createLocalStorageNamespace();
   virtual WebKit::Platform::FileHandle databaseOpenFile(
       const WebKit::WebString& vfs_file_name, int desired_flags);
   virtual int databaseDeleteFile(const WebKit::WebString& vfs_file_name,
                                  bool sync_dir);
@@ skipping 135 matching lines @@
   scoped_refptr<cc::ContextProvider> shared_offscreen_context_;
 
   webkit::WebCompositorSupportImpl compositor_support_;
 
   scoped_ptr<WebCryptoImpl> web_crypto_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_