Remove the enable flag from all plugins after the option has been ported.

chrome/browser/plugins/plugin_prefs.cc

 // Copyright (c) 2012 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/plugins/plugin_prefs.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 118 matching lines @@
     ListPrefUpdate update(prefs_, prefs::kPluginsPluginsList);
     base::ListValue* saved_plugins_list = update.Get();
     if (saved_plugins_list && !saved_plugins_list->empty()) {
       for (auto& plugin_value : *saved_plugins_list) {
         base::DictionaryValue* plugin;
         if (!plugin_value.GetAsDictionary(&plugin)) {
           LOG(WARNING) << "Invalid entry in " << prefs::kPluginsPluginsList;
           continue;  // Oops, don't know what to do with this item.
         }
 
         bool enabled;

[Bernhard Bauer, 2017/04/25 14:15:37]

I would simplify this to:

  bool enabled = true;
  if (plugin->GetBoolean("enabled", &enabled))
    plugin->Remove("enabled", nullptr);

[pastarmovj, 2017/04/26 07:26:38]

Done.

         if (!plugin->GetBoolean("enabled", &enabled))
           enabled = true;
+        else
+          plugin->Remove("enabled", nullptr);
 
         // Migrate disabled plugins and re-enable them all internally.
         // TODO(http://crbug.com/662006): Remove migration eventually.
         if (!enabled) {
           base::string16 name;
           plugin->GetString("name", &name);
           if (IsPDFViewerPlugin(name))
             prefs->SetBoolean(prefs::kPluginsAlwaysOpenPdfExternally, true);
           if (IsAdobeFlashPlayerPlugin(name)) {
             HostContentSettingsMapFactory::GetForProfile(profile_)
@@ skipping 130 matching lines @@
   }
 }
 
 void PluginPrefs::NotifyPluginStatusChanged() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PLUGIN_ENABLE_STATUS_CHANGED,
       content::Source<Profile>(profile_),
       content::NotificationService::NoDetails());
 }