Added unpacking step

chrome/installer/mac/app/Downloader.m

 // Copyright 2016 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.
 
 #import "Downloader.h"
 
 #include <assert.h>
 
 @implementation Downloader
 
 @synthesize delegate = delegate_;
 
-+ (NSString*)getChromeDownloadFilePath {
-  NSArray* downloadPaths = NSSearchPathForDirectoriesInDomains(
-      NSDownloadsDirectory, NSUserDomainMask, YES);
-  NSString* completeFilePath = [NSString
-      pathWithComponents:@[ [downloadPaths firstObject], @"GoogleChrome.dmg" ]];
-  return completeFilePath;
-}
-
 // Downloads contents of chromeURL to downloads folders and delegates the work
 // to the DownloadDelegate class.
-- (void)downloadChromeImageToDownloadsDirectory:(NSURL*)chromeImageURL {
+- (void)downloadChromeImageFrom:(NSURL*)chromeImageURL {
   NSURLSession* session =
       [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration
                                                  defaultSessionConfiguration]
                                     delegate:self
                                delegateQueue:nil];
   [[session downloadTaskWithURL:chromeImageURL] resume];
   [session finishTasksAndInvalidate];
 }
 
 // Provides updates to download progress.
 - (void)URLSession:(NSURLSession*)session
                  downloadTask:(NSURLSessionDownloadTask*)downloadTask
                  didWriteData:(int64_t)bytesWritten
             totalBytesWritten:(int64_t)totalBytesWritten
     totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {
   double downloadProgressPercentage =
       (double)totalBytesWritten / totalBytesExpectedToWrite * 100.0;
-  [delegate_ didDownloadData:downloadProgressPercentage];
+  [delegate_ downloader:self percentProgress:downloadProgressPercentage];
 }
 
 // Delegate method to move downloaded disk image to user's Download directory.
 - (void)URLSession:(NSURLSession*)session
                  downloadTask:(NSURLSessionDownloadTask*)downloadTask
     didFinishDownloadingToURL:(NSURL*)location {
   assert([location isFileURL]);
-  NSFileManager* manager = [NSFileManager defaultManager];
-  NSURL* downloadsDirectory =
-      [NSURL fileURLWithPath:[Downloader getChromeDownloadFilePath]];
-  NSError* fileManagerError = nil;
-  [manager moveItemAtURL:location
-                   toURL:downloadsDirectory
-                   error:&fileManagerError];
-  if (fileManagerError) {
-    [delegate_ downloader:self onDownloadFailureWithError:fileManagerError];
-  }
-  [delegate_ downloader:self onDownloadSuccess:location];
+  [delegate_ downloader:self onSuccess:location];
 }
 
 - (void)URLSession:(NSURLSession*)session
                     task:(NSURLSessionTask*)task
     didCompleteWithError:(NSError*)error {
   if (error) {
-    [delegate_ downloader:self onDownloadFailureWithError:error];
+    [delegate_ downloader:self onFailure:error];
   }
 }
 
 @end