Refactor the UpdateEngine and its actions in the component updater.

components/update_client/utils.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 COMPONENTS_UPDATE_CLIENT_UTILS_H_
 #define COMPONENTS_UPDATE_CLIENT_UTILS_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 10 matching lines @@
 }
 
 namespace net {
 class URLFetcher;
 class URLFetcherDelegate;
 class URLRequestContextGetter;
 }
 
 namespace update_client {
 
+class Component;
 struct CrxComponent;
-struct CrxUpdateItem;
 
 // Defines a name-value pair that represents an installer attribute.
 // Installer attributes are component-specific metadata, which may be serialized
 // in an update check request.
 using InstallerAttribute = std::pair<std::string, std::string>;
 
 // An update protocol request starts with a common preamble which includes
 // version and platform information for Chrome and the operating system,
 // followed by a request body, which is the actual payload of the request.
 // For example:
@@ skipping 39 matching lines @@
 
 // Returns true if the url request of |fetcher| was succesful.
 bool FetchSuccess(const net::URLFetcher& fetcher);
 
 // Returns the error code which occured during the fetch. The function returns 0
 // if the fetch was successful. If errors happen, the function could return a
 // network error, an http response code, or the status of the fetch, if the
 // fetch is pending or canceled.
 int GetFetchError(const net::URLFetcher& fetcher);
 
-// Returns true if the |update_item| contains a valid differential update url.
-bool HasDiffUpdate(const CrxUpdateItem* update_item);
+// Returns true if the |component| contains a valid differential update url.
+bool HasDiffUpdate(const Component& component);
 
 // Returns true if the |status_code| represents a server error 5xx.
 bool IsHttpServerError(int status_code);
 
 // Deletes the file and its directory, if the directory is empty. If the
 // parent directory is not empty, the function ignores deleting the directory.
 // Returns true if the file and the empty directory are deleted.
 bool DeleteFileAndEmptyParentDirectory(const base::FilePath& filepath);
 
 // Returns the component id of the |component|. The component id is in a
@@ skipping 16 matching lines @@
 // Removes the unsecure urls in the |urls| parameter.
 void RemoveUnsecureUrls(std::vector<GURL>* urls);
 
 // Adapter function for the old definitions of CrxInstaller::Install until the
 // component installer code is migrated to use a REsult instead of bool.
 CrxInstaller::Result InstallFunctionWrapper(base::Callback<bool()> callback);
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UTILS_H_