Replace all enums with enum classes in permissions code.

chrome/browser/permissions/permission_util.h

 // 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_PERMISSIONS_PERMISSION_UTIL_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_UTIL_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/permissions/permission_request.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "url/gurl.h"
 
 class Profile;
 
 namespace content {
 enum class PermissionType;
 }  // namespace content
 
 enum class PermissionSourceUI;
 
 // This enum backs a UMA histogram, so it must be treated as append-only.
-enum PermissionAction {
+enum class PermissionAction {
   GRANTED = 0,
   DENIED = 1,
   DISMISSED = 2,
   IGNORED = 3,
   REVOKED = 4,
   REENABLED = 5,
   REQUESTED = 6,
 
   // Always keep this at the end.
-  PERMISSION_ACTION_NUM,
+  NUM,
 };
 
 // Identifies the source or reason for a permission status being returned. This
 // enum backs an UMA histogram and must be treated as append-only.
 enum class PermissionStatusSource {
   // The reason for the status is not specified.
   UNSPECIFIED,
 
   // The status is the result of being blocked due to the user dismissing a
   // permission prompt multiple times.
@@ skipping 70 matching lines @@
     ContentSettingsType content_type_;
     PermissionSourceUI source_ui_;
     bool is_initially_allowed_;
   };
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PermissionUtil);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_UTIL_H_