Move the supervised user error page to a component

chrome/browser/supervised_user/supervised_user_navigation_observer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/supervised_user/supervised_user_navigation_observer.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 25 matching lines @@
   supervised_user_service_ =
       SupervisedUserServiceFactory::GetForProfile(profile);
   url_filter_ = supervised_user_service_->GetURLFilterForUIThread();
   supervised_user_service_->AddObserver(this);
 }
 
 // static
 void SupervisedUserNavigationObserver::OnRequestBlocked(
     const content::ResourceRequestInfo::WebContentsGetter& web_contents_getter,
     const GURL& url,
-    SupervisedUserURLFilter::FilteringBehaviorReason reason,
+    supervised_user_error_page::FilteringBehaviorReason reason,
     const base::Callback<void(bool)>& callback) {
   content::WebContents* web_contents = web_contents_getter.Run();
   if (!web_contents) {
     content::BrowserThread::PostTask(
         content::BrowserThread::IO, FROM_HERE, base::Bind(callback, false));
     return;
   }
 
   SupervisedUserNavigationObserver* navigation_observer =
       SupervisedUserNavigationObserver::FromWebContents(web_contents);
@@ skipping 40 matching lines @@
   url_filter_->GetFilteringBehaviorForURLWithAsyncChecks(
       web_contents_->GetLastCommittedURL(),
       base::Bind(&SupervisedUserNavigationObserver::URLFilterCheckCallback,
                  weak_ptr_factory_.GetWeakPtr(),
                  web_contents_->GetLastCommittedURL()));
 }
 
 void SupervisedUserNavigationObserver::URLFilterCheckCallback(
     const GURL& url,
     SupervisedUserURLFilter::FilteringBehavior behavior,
-    SupervisedUserURLFilter::FilteringBehaviorReason reason,
+    supervised_user_error_page::FilteringBehaviorReason reason,
     bool uncertain) {
   // If the page has been changed in the meantime, we can exit.
   if (url != web_contents_->GetLastCommittedURL())
     return;
 
   if (behavior == SupervisedUserURLFilter::FilteringBehavior::BLOCK) {
     SupervisedUserInterstitial::Show(web_contents_, url, reason,
                                      base::Callback<void(bool)>());
   }
 }