remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc

 // 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.
 
 #include "content/ppapi_plugin/ppapi_webkitplatformsupport_impl.h"
 
 #include <map>
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
@@ skipping 188 matching lines @@
   NOTREACHED();
 }
 
 WebKit::WebString PpapiWebKitPlatformSupportImpl::cookies(
     const WebKit::WebURL& url,
     const WebKit::WebURL& first_party_for_cookies) {
   NOTREACHED();
   return WebKit::WebString();
 }
 
-void PpapiWebKitPlatformSupportImpl::prefetchHostName(
-    const WebKit::WebString&) {
-  NOTREACHED();
-}
-
 WebKit::WebString PpapiWebKitPlatformSupportImpl::defaultLocale() {
   NOTREACHED();
   return WebKit::WebString();
 }
 
 WebKit::WebThemeEngine* PpapiWebKitPlatformSupportImpl::themeEngine() {
   NOTREACHED();
   return NULL;
 }
 
@@ skipping 31 matching lines @@
   NOTREACHED();
 }
 
 int PpapiWebKitPlatformSupportImpl::databaseDeleteFile(
     const WebKit::WebString& vfs_file_name, bool sync_dir) {
   NOTREACHED();
   return 0;
 }
 
 }  // namespace content