Factor Chrome details out of update manifest fetching.

chrome/browser/extensions/updater/chrome_manifest_fetch_data_delegate.h

+// Copyright 2014 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_UPDATER_CHROME_MANIFEST_FETCH_DATA_DELEGATE_H_
+#define CHROME_BROWSER_EXTENSIONS_UPDATER_CHROME_MANIFEST_FETCH_DATA_DELEGATE_H_
+
+#include "base/macros.h"
+#include "extensions/browser/updater/manifest_fetch_data_delegate.h"
+
+class ChromeManifestFetchDataDelegate
+    : public extensions::ManifestFetchDataDelegate {
+ public:
+  ChromeManifestFetchDataDelegate();
+  virtual ~ChromeManifestFetchDataDelegate();
+
+  // ManifestFetchDelegate implementation.
+  virtual std::string GetBaseQueryParams() OVERRIDE;
+  virtual bool ShouldAlwaysCheckWebstore() OVERRIDE;
+  virtual std::string GetBrandCode() OVERRIDE;
+  virtual std::string GetPingParamsAndData(
+      const std::string& extension_id,
+      const extensions::ManifestFetchData::PingData& old_ping_data,
+      extensions::ManifestFetchData::PingData* new_ping_data) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeManifestFetchDataDelegate);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_CHROME_MANIFEST_FETCH_DATA_DELEGATE_H_