remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/worker/worker_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/worker/worker_webkitplatformsupport_impl.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/platform_file.h"
@@ skipping 136 matching lines @@
     const WebString& value) {
   NOTREACHED();
 }
 
 WebString WorkerWebKitPlatformSupportImpl::cookies(
     const WebURL& url, const WebURL& first_party_for_cookies) {
   // WebSocketHandshake may access cookies in worker process.
   return WebString();
 }
 
-void WorkerWebKitPlatformSupportImpl::prefetchHostName(const WebString&) {
-  NOTREACHED();
-}
-
 WebString WorkerWebKitPlatformSupportImpl::defaultLocale() {
   NOTREACHED();
   return WebString();
 }
 
 WebStorageNamespace*
 WorkerWebKitPlatformSupportImpl::createLocalStorageNamespace() {
   NOTREACHED();
   return 0;
 }
@@ skipping 138 matching lines @@
     return;
   QuotaDispatcher::ThreadSpecificInstance(
       thread_safe_sender_.get(),
       quota_message_filter_.get())->QueryStorageUsageAndQuota(
           storage_partition,
           static_cast<quota::StorageType>(type),
           QuotaDispatcher::CreateWebStorageQuotaCallbacksWrapper(callbacks));
 }
 
 }  // namespace content