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 8c68b31987f41b92e23ab4bc62cfb0cfaa497127..1e2d7b8b37324aef6fafc50fe24f306a748340a6 100644
--- a/chrome/browser/renderer_host/chrome_render_message_filter.cc
+++ b/chrome/browser/renderer_host/chrome_render_message_filter.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/extensions/api/i18n/default_locale_handler.h"
 #include "chrome/common/render_messages.h"
+#include "components/predictor/common/predictor_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 +64,7 @@ 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(DnsPredictorMsg_RequestPrefetch, OnDnsPrefetch)

[gunsch, 2014/10/10 20:59:23]

I expect this change here is not quite correct, but creating a new
RenderMessageFilter in chrome/browser/renderer_host seemed excessive.
Suggestions appreciated.

[palmer, 2014/10/13 23:56:21]

I'm not sure I understand the issue?

[gunsch, 2014/10/14 15:54:38]

Maybe there's no issue, but it looks like other MessageFilter instances stick
with handling IPC messages from one "IPC namespace" (e.g. ChromeViewHostMsg).

     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_Preconnect, OnPreconnect)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ResourceTypeStats,
                         OnResourceTypeStats)