Make DETECT_IMPORTANT_CONTENT the default Plugins content setting based

chrome/browser/plugins/plugins_field_trial.h

Index: chrome/browser/plugins/plugins_field_trial.h
diff --git a/chrome/browser/plugins/plugins_field_trial.h b/chrome/browser/plugins/plugins_field_trial.h
deleted file mode 100644
index 3b4d1c348c70e46f841aef5451518ef7743ec62e..0000000000000000000000000000000000000000
--- a/chrome/browser/plugins/plugins_field_trial.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef CHROME_BROWSER_PLUGINS_PLUGINS_FIELD_TRIAL_H_
-#define CHROME_BROWSER_PLUGINS_PLUGINS_FIELD_TRIAL_H_
-
-#include "base/macros.h"
-#include "components/content_settings/core/common/content_settings.h"
-#include "components/content_settings/core/common/content_settings_types.h"
-
-// This class manages the Plugins field trials.
-class PluginsFieldTrial {
- public:
-  // Returns the effective content setting for plugins. Passes non-plugin
-  // content settings through without modification.
-  static ContentSetting EffectiveContentSetting(ContentSettingsType type,
-                                                ContentSetting setting);
-
-  // Returns true if the Plugin Power Saver feature is forced on, overriding
-  // the user's Content Settings.
-  static bool IsForcePluginPowerSaverEnabled();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(PluginsFieldTrial);
-};
-
-#endif  // CHROME_BROWSER_PLUGINS_PLUGINS_FIELD_TRIAL_H_