remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/worker/worker_webkitplatformsupport_impl.cc

Index: content/worker/worker_webkitplatformsupport_impl.cc
diff --git a/content/worker/worker_webkitplatformsupport_impl.cc b/content/worker/worker_webkitplatformsupport_impl.cc
index c9042f02d2445615db29bcfaebabdc50f71a5016..144db959a3d223eaca17bb650f0c97cb5e562dfc 100644
--- a/content/worker/worker_webkitplatformsupport_impl.cc
+++ b/content/worker/worker_webkitplatformsupport_impl.cc
@@ -154,10 +154,6 @@ WebString WorkerWebKitPlatformSupportImpl::cookies(
   return WebString();
 }
 
-void WorkerWebKitPlatformSupportImpl::prefetchHostName(const WebString&) {
-  NOTREACHED();
-}
-
 WebString WorkerWebKitPlatformSupportImpl::defaultLocale() {
   NOTREACHED();
   return WebString();