Move permission warning message handling from PermissionSet to PermissionMessageProvider.

chrome/common/extensions/permissions/app_permission_message_provider.h

Index: chrome/common/extensions/permissions/app_permission_message_provider.h
diff --git a/chrome/common/extensions/permissions/app_permission_message_provider.h b/chrome/common/extensions/permissions/app_permission_message_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..9020ff993ba45ad50637149c5c4bc58c61e83212
--- /dev/null
+++ b/chrome/common/extensions/permissions/app_permission_message_provider.h
@@ -0,0 +1,34 @@
+// Copyright 2013 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_COMMON_EXTENSIONS_PERMISSIONS_APP_PERMISSION_MESSAGE_PROVIDER_H_
+#define CHROME_COMMON_EXTENSIONS_PERMISSIONS_APP_PERMISSION_MESSAGE_PROVIDER_H_
+
+#include "chrome/common/extensions/permissions/extension_permission_message_provider.h"
+#include "extensions/common/permissions/permission_message_provider.h"
+
+namespace extensions {
+
+// Gets permission messages for platform apps.
+class AppPermissionMessageProvider : public ExtensionPermissionMessageProvider {
+ public:
+  AppPermissionMessageProvider();
+  virtual ~AppPermissionMessageProvider();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(PermissionsTest, IsHostPrivilegeIncrease);
+
+  // ExtensionPermissionMessageProvider overrides.
+  virtual std::set<PermissionMessage> GetHostPermissionMessages(
+      const PermissionSet* permissions) const OVERRIDE;
+  virtual bool IsHostPrivilegeIncrease(
+      const PermissionSet* old_permissions,
+      const PermissionSet* new_permissions) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(AppPermissionMessageProvider);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_APP_PERMISSION_MESSAGE_PROVIDER_H_