remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc

Index: content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc
diff --git a/content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc b/content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc
index 5e7dca67330aff139e38fb430e1fc1a41f7c6f79..1ac82dfcdaa1c5d42f9bdcf9d98edbddae29cf3c 100644
--- a/content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc
+++ b/content/ppapi_plugin/ppapi_webkitplatformsupport_impl.cc
@@ -206,11 +206,6 @@ WebKit::WebString PpapiWebKitPlatformSupportImpl::cookies(
   return WebKit::WebString();
 }
 
-void PpapiWebKitPlatformSupportImpl::prefetchHostName(
-    const WebKit::WebString&) {
-  NOTREACHED();
-}
-
 WebKit::WebString PpapiWebKitPlatformSupportImpl::defaultLocale() {
   NOTREACHED();
   return WebKit::WebString();