remove implementation of obsolete WebKitPlatformSupport::prefetchHostName.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 006c43d0a48f02f85448f985eecd45c6f69966ac..9f8ef8df42334657d95fad1b5fec70a598d38482 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -1080,11 +1080,6 @@ bool ChromeContentRendererClient::IsLinkVisited(unsigned long long link_hash) {
   return visited_link_slave_->IsVisited(link_hash);
 }
 
-void ChromeContentRendererClient::PrefetchHostName(const char* hostname,
-                                                   size_t length) {
-  net_predictor_->Resolve(hostname, length);
-}
-
 WebKit::WebPrescientNetworking*
 ChromeContentRendererClient::GetPrescientNetworking() {
   return prescient_networking_dispatcher_.get();