Move the supervised user error page to a component

chrome/browser/supervised_user/supervised_user_interstitial.h

Index: chrome/browser/supervised_user/supervised_user_interstitial.h
diff --git a/chrome/browser/supervised_user/supervised_user_interstitial.h b/chrome/browser/supervised_user/supervised_user_interstitial.h
index f90bf1e67ddabbb228a49da6a90485374399bbf4..2948548132e9bbcab18b8d9f7ac8a2573ff0d309 100644
--- a/chrome/browser/supervised_user/supervised_user_interstitial.h
+++ b/chrome/browser/supervised_user/supervised_user_interstitial.h
@@ -12,6 +12,7 @@
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/supervised_user/supervised_user_service_observer.h"
 #include "chrome/browser/supervised_user/supervised_user_url_filter.h"
+#include "components/supervised_user_error_page/supervised_user_error_page.h"
 #include "content/public/browser/interstitial_page_delegate.h"
 #include "url/gurl.h"
 
@@ -33,18 +34,18 @@ class SupervisedUserInterstitial : public content::InterstitialPageDelegate,
 
   static void Show(content::WebContents* web_contents,
                    const GURL& url,
-                   SupervisedUserURLFilter::FilteringBehaviorReason reason,
+                   supervised_user_error_page::FilteringBehaviorReason reason,
                    const base::Callback<void(bool)>& callback);
 
   static std::string GetHTMLContents(
       Profile* profile,
-      SupervisedUserURLFilter::FilteringBehaviorReason reason);
+      supervised_user_error_page::FilteringBehaviorReason reason);
 
  private:
   SupervisedUserInterstitial(
       content::WebContents* web_contents,
       const GURL& url,
-      SupervisedUserURLFilter::FilteringBehaviorReason reason,
+      supervised_user_error_page::FilteringBehaviorReason reason,
       const base::Callback<void(bool)>& callback);
   ~SupervisedUserInterstitial() override;
 
@@ -80,7 +81,7 @@ class SupervisedUserInterstitial : public content::InterstitialPageDelegate,
   content::InterstitialPage* interstitial_page_;  // Owns us.
 
   GURL url_;
-  SupervisedUserURLFilter::FilteringBehaviorReason reason_;
+  supervised_user_error_page::FilteringBehaviorReason reason_;
 
   base::Callback<void(bool)> callback_;