Move SystemIndicator parsing out of Extension class

chrome/common/extensions/api/system_indicator/system_indicator_handler.h

+// Copyright (c) 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_API_SYSTEM_INDICATOR_SYSTEM_INDICATOR_HANDLER_H_
+#define CHROME_COMMON_EXTENSIONS_API_SYSTEM_INDICATOR_SYSTEM_INDICATOR_HANDLER_H_
+
+#include "base/string16.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/manifest_handler.h"
+
+namespace extensions {
+
+// Parses the "system_indicator" manifest key.
+class SystemIndicatorHandler : public ManifestHandler {
+ public:
+  SystemIndicatorHandler();
+  virtual ~SystemIndicatorHandler();
+
+  virtual bool Parse(Extension* extension, string16* error) OVERRIDE;
+
+ private:
+  virtual const std::vector<std::string> Keys() const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemIndicatorHandler);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_API_SYSTEM_INDICATOR_SYSTEM_INDICATOR_HANDLER_H_