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

chrome/browser/plugins/plugin_prefs.cc

Index: chrome/browser/plugins/plugin_prefs.cc
diff --git a/chrome/browser/plugins/plugin_prefs.cc b/chrome/browser/plugins/plugin_prefs.cc
index 0c418d1cdd0cbc649bcdff0d001ad39740ade5db..3db8f658935cff4e213e602a0e6f5ace025f3163 100644
--- a/chrome/browser/plugins/plugin_prefs.cc
+++ b/chrome/browser/plugins/plugin_prefs.cc
@@ -139,6 +139,8 @@ void PluginPrefs::SetPrefs(PrefService* prefs) {
         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.