Remove NetPrefObserver class and two prefs that do not do anything.

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index f520e2a5f3a22815d93b4fa75c8fbd79d646cdba..dabbbb82c5e48975ffb4583db755c78a0bfa4915 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -44,7 +44,6 @@
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
-#include "chrome/browser/net/net_pref_observer.h"
 #include "chrome/browser/net/predictor.h"
 #include "chrome/browser/net/proxy_service_factory.h"
 #include "chrome/browser/permissions/permission_manager.h"
@@ -847,12 +846,6 @@ void ProfileImpl::OnLocaleReady() {
       CreateBrowserContextServices(this);
   }
 
-  DCHECK(!net_pref_observer_);
-  {
-    TRACE_EVENT0("browser", "ProfileImpl::OnPrefsLoaded:NetPrefObserver")
-    net_pref_observer_.reset(new NetPrefObserver(prefs_.get()));
-  }
-
   ChromeVersionService::OnProfileLoaded(prefs_.get(), IsNewProfile());
   DoFinalInit();
 }