Clean up dns prefetch code, and also port it.

chrome/common/temp_scaffolding_stubs.cc

Index: chrome/common/temp_scaffolding_stubs.cc
diff --git a/chrome/common/temp_scaffolding_stubs.cc b/chrome/common/temp_scaffolding_stubs.cc
index 287b1187afd2d50080b4b0ab725678d4a4fabeac..48d1eef710ebada790180df3585d4c27b45d1263 100644
--- a/chrome/common/temp_scaffolding_stubs.cc
+++ b/chrome/common/temp_scaffolding_stubs.cc
@@ -164,7 +164,7 @@ void OpenFirstRunDialog(Profile* profile) { NOTIMPLEMENTED(); }
 
 GURL NewTabUIURL() {
   NOTIMPLEMENTED();
-  // TODO(port): returning a blank URL here confuses the page IDs so make sure 
+  // TODO(port): returning a blank URL here confuses the page IDs so make sure
   // we load something
   return GURL("http://dev.chromium.org");
 }
@@ -275,7 +275,7 @@ const std::wstring& TabContents::GetTitle() const {
   NavigationEntry* entry = controller_->GetTransientEntry();
   if (entry)
     return entry->GetTitleForDisplay();
-  
+
   entry = controller_->GetLastCommittedEntry();
   if (entry)
     return entry->GetTitleForDisplay();
@@ -324,7 +324,7 @@ void TabContents::UpdateMaxPageID(int32 page_id) {
   // testing.
   if (GetSiteInstance())
     GetSiteInstance()->UpdateMaxPageID(page_id);
-  
+
   if (AsWebContents())
     AsWebContents()->process()->UpdateMaxPageID(page_id);
   else
@@ -356,26 +356,6 @@ bool IsPluginProcess() {
 
 //--------------------------------------------------------------------------
 
-namespace chrome_browser_net {
-
-void EnableDnsPrefetch(bool) { NOTIMPLEMENTED(); }
-
-void DnsPrefetchGetHtmlInfo(std::string* output) { NOTIMPLEMENTED(); }
-
-void DnsPrefetchList(const std::vector<std::string>& hostnames) {
-  NOTIMPLEMENTED();
-}
-
-void SaveHostNamesForNextStartup(PrefService* local_state) { NOTIMPLEMENTED(); }
-
-void TrimSubresourceReferrers()  { NOTIMPLEMENTED(); }
-
-void SaveSubresourceReferrers(PrefService* local_state) { NOTIMPLEMENTED(); }
-
-}  // namespace chrome_browser_net
-
-//--------------------------------------------------------------------------
-
 // This is from chrome_plugin_util.cc.
 void CPB_Free(void* memory) { NOTIMPLEMENTED(); }