Enforce the 'requirements' field in manifests.

chrome/browser/policy/app_pack_updater.h

Index: chrome/browser/policy/app_pack_updater.h
diff --git a/chrome/browser/policy/app_pack_updater.h b/chrome/browser/policy/app_pack_updater.h
index c8f5733b03d4333a467df0da7252c441763c672e..7e65105359201a6ab726d501b42f704eafe03e6a 100644
--- a/chrome/browser/policy/app_pack_updater.h
+++ b/chrome/browser/policy/app_pack_updater.h
@@ -149,7 +149,19 @@ class AppPackUpdater : public CloudPolicySubsystem::Observer,
       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,