Supervised Users: Create ResourceThrottle only if filtering is enabled

chrome/browser/supervised_user/supervised_user_service.cc

Index: chrome/browser/supervised_user/supervised_user_service.cc
diff --git a/chrome/browser/supervised_user/supervised_user_service.cc b/chrome/browser/supervised_user/supervised_user_service.cc
index 324f525d62632145ea2ce299f1691c02c2797820..a470f3e61eac67f13219e63cce019f03dede20cf 100644
--- a/chrome/browser/supervised_user/supervised_user_service.cc
+++ b/chrome/browser/supervised_user/supervised_user_service.cc
@@ -441,6 +441,13 @@ SupervisedUserService::URLFilterContext::io_url_filter() const {
   return io_url_filter_.get();
 }
 
+void SupervisedUserService::URLFilterContext::SetEnabled(bool enabled) {
+  ui_url_filter_->SetEnabled(enabled);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&SupervisedUserURLFilter::SetEnabled,
+                                     io_url_filter_, enabled));
+}
+
 void SupervisedUserService::URLFilterContext::SetDefaultFilteringBehavior(
     SupervisedUserURLFilter::FilteringBehavior behavior) {
   ui_url_filter_->SetDefaultFilteringBehavior(behavior);
@@ -672,6 +679,8 @@ void SupervisedUserService::SetActive(bool active) {
     BrowserList::RemoveObserver(this);
 #endif
   }
+
+  url_filter_context_.SetEnabled(active_);
 }
 
 #if !defined(OS_ANDROID)