Componentize renderer side of DNS prefetching.

chrome/browser/renderer_host/chrome_render_message_filter.cc

Index: chrome/browser/renderer_host/chrome_render_message_filter.cc
diff --git a/chrome/browser/renderer_host/chrome_render_message_filter.cc b/chrome/browser/renderer_host/chrome_render_message_filter.cc
index 092ce6fea643aac7606ebe3de73d56e735c8c783..2ffe311d8a31ae7032c17260eb12e6b8e4d9bda1 100644
--- a/chrome/browser/renderer_host/chrome_render_message_filter.cc
+++ b/chrome/browser/renderer_host/chrome_render_message_filter.cc
@@ -17,6 +17,8 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/render_messages.h"
+#include "components/dns_prefetch/common/prefetch_common.h"
+#include "components/dns_prefetch/common/prefetch_messages.h"
 #include "components/web_cache/browser/web_cache_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
@@ -63,7 +65,7 @@ ChromeRenderMessageFilter::~ChromeRenderMessageFilter() {
 bool ChromeRenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChromeRenderMessageFilter, message)
-    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_DnsPrefetch, OnDnsPrefetch)
+    IPC_MESSAGE_HANDLER(DnsPrefetchMsg_RequestPrefetch, OnDnsPrefetch)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_Preconnect, OnPreconnect)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ResourceTypeStats,
                         OnResourceTypeStats)
@@ -101,9 +103,9 @@ void ChromeRenderMessageFilter::OverrideThreadForMessage(
 }
 
 void ChromeRenderMessageFilter::OnDnsPrefetch(
-    const std::vector<std::string>& hostnames) {
+    const dns_prefetch::LookupRequest& request) {
   if (predictor_)
-    predictor_->DnsPrefetchList(hostnames);
+    predictor_->DnsPrefetchList(request.hostname_list);
 }
 
 void ChromeRenderMessageFilter::OnPreconnect(const GURL& url) {