Enforce the 'requirements' field in manifests.

chrome/browser/policy/app_pack_updater.h

 // Copyright (c) 2012 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_POLICY_APP_PACK_UPDATER_H_
 #define CHROME_BROWSER_POLICY_APP_PACK_UPDATER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 131 matching lines @@
   virtual void OnExtensionDownloadFailed(
       const std::string& id,
       Error error,
       const PingResult& ping_result) OVERRIDE;
 
   virtual void OnExtensionDownloadFinished(
       const std::string& id,
       const FilePath& path,
       const GURL& download_url,
       const std::string& version,
-      const PingResult& ping_result) OVERRIDE;
+      const PingResult& ping_result,
+      const bool is_sync) OVERRIDE;
+
+  // TODO(eriq): Take out this hack and actually provide sync data.
+  virtual void OnExtensionDownloadFinished(
+      const std::string& id,
+      const FilePath& path,
+      const GURL& download_url,
+      const std::string& version,
+      const PingResult& ping_result) {
+    OnExtensionDownloadFinished(id, path, download_url, version,
+                                ping_result, false);
+  }
 
   virtual void OnBlacklistDownloadFinished(
       const std::string& data,
       const std::string& package_hash,
       const std::string& version,
       const PingResult& ping_result) OVERRIDE;
 
   virtual bool IsExtensionPending(const std::string& id) OVERRIDE;
 
   virtual bool GetExtensionExistingVersion(const std::string& id,
@@ skipping 68 matching lines @@
 
   // Request context used by the |downloader_|.
   net::URLRequestContextGetter* request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(AppPackUpdater);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_APP_PACK_UPDATER_H_