Revert "Fix a bug where ContentSettingsHandler did not listen for OTR content settings changes."

This reverts commit 3d148e7d.

BUG=417597
TBR=bauerb@chromium.org,dhnishi@chromium.org,cpu@chromium.org

Review URL: https://codereview.chromium.org/595213006

Cr-Commit-Position: refs/heads/master@{#296810}

chrome/browser/ui/webui/options/content_settings_handler.cc

@@ -527,21 +527,16 @@ void ContentSettingsHandler::Observe(
     const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
-      Profile* profile = content::Source<Profile>(source).ptr();
-      if (profile->IsOffTheRecord()) {
+      if (content::Source<Profile>(source).ptr()->IsOffTheRecord()) {
         web_ui()->CallJavascriptFunction(
             "ContentSettingsExceptionsArea.OTRProfileDestroyed");
-        observer_.Remove(profile->GetHostContentSettingsMap());
       }
       break;
     }
 
     case chrome::NOTIFICATION_PROFILE_CREATED: {
-      Profile* profile = content::Source<Profile>(source).ptr();
-      if (profile->IsOffTheRecord()) {
+      if (content::Source<Profile>(source).ptr()->IsOffTheRecord())
         UpdateAllOTRExceptionsViewsFromModel();
-        observer_.Add(profile->GetHostContentSettingsMap());
-      }
       break;
     }