remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

android_webview/renderer/aw_content_renderer_client.h

 // Copyright 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 ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 
 #include "content/public/renderer/content_renderer_client.h"
 
 #include "android_webview/renderer/aw_render_process_observer.h"
@@ skipping 18 matching lines @@
                             std::string* error_domain) OVERRIDE;
   virtual void GetNavigationErrorStrings(
       WebKit::WebFrame* frame,
       const WebKit::WebURLRequest& failed_request,
       const WebKit::WebURLError& error,
       std::string* error_html,
       string16* error_description) OVERRIDE;
   virtual unsigned long long VisitedLinkHash(const char* canonical_url,
                                              size_t length) OVERRIDE;
   virtual bool IsLinkVisited(unsigned long long link_hash) OVERRIDE;
-  virtual void PrefetchHostName(const char* hostname, size_t length) OVERRIDE;
 
  private:
   scoped_ptr<AwRenderProcessObserver> aw_render_process_observer_;
   scoped_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_