Move web store data fetching and parsing out of WebstoreStandaloneInstaller.

chrome/browser/extensions/webstore_data_fetcher_delegate.h

+// 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_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_DELEGATE_H_
+#define CHROME_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_DELEGATE_H_
+
+#include <string>
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace extensions {
+
+class WebstoreDataFetcherDelegate {
+ public:
+  // Invoked when the web store data request failed.
+  virtual void OnWebstoreRequestFailure() = 0;
+
+  // Invoked when the web store response parsing is successful. Delegate takes
+  // ownership of |webstore_data|.
+  virtual void OnWebstoreResponseParseSuccess(
+      base::DictionaryValue* webstore_data) = 0;
+
+  // Invoked when the web store response parsing is failed.
+  virtual void OnWebstoreResponseParseFailure(const std::string& error) = 0;
+
+ protected:
+  virtual ~WebstoreDataFetcherDelegate() {}
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_DELEGATE_H_