Added unpacking step

chrome/installer/mac/app/Downloader.h

Index: chrome/installer/mac/app/Downloader.h
diff --git a/chrome/installer/mac/app/Downloader.h b/chrome/installer/mac/app/Downloader.h
index 72c63ad76d65f00a8fac913d2f987652c899f8b8..d41059e5652d6e2cf174163d91924a706e1c3112 100644
--- a/chrome/installer/mac/app/Downloader.h
+++ b/chrome/installer/mac/app/Downloader.h
@@ -9,9 +9,10 @@
 
 @class Downloader;
 @protocol DownloaderDelegate
-- (void)didDownloadData:(double)downloadProgressPercentage;
 - (void)downloader:(Downloader*)download
-    onDownloadSuccess:(NSURL*)diskImagePath;
+    didDownloadData:(double)downloadProgressPercentage;

[Sidney San Martín, 2016/08/13 12:37:18]

`downloader:didDownloadData:` suggests that the second parameter is some data.
I'd look for a clearer name — `downloader:progress:` would be fine, but there
are other good ones too.

[Anna Zeng, 2016/08/16 23:07:39]

Done.

+- (void)downloader:(Downloader*)download
+    onDownloadSuccessWithDiskURL:(NSURL*)diskImagePath;
 - (void)downloader:(Downloader*)download
     onDownloadFailureWithError:(NSError*)error;
 @end
@@ -20,12 +21,8 @@
 
 @property(nonatomic, assign) id<DownloaderDelegate> delegate;
 
-// Takes an NSData with a response XML from Omaha and writes the latest
-// version of chrome to the user's download directory.
-- (void)downloadChromeImageToDownloadsDirectory:(NSURL*)chromeImageURL;
-
-// Returns a path to a user's home download folder.
-+ (NSString*)getChromeDownloadFilePath;
+// Downloads Chrome from the |chromeImageURL| to the local hard drive.

[Sidney San Martín, 2016/08/13 12:37:18]

No "the".

[Anna Zeng, 2016/08/16 23:07:39]

Done.

+- (void)downloadChromeImageFrom:(NSURL*)chromeImageURL;
 
 @end