Added unpacking step

chrome/installer/mac/app/OmahaCommunication.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 "OmahaCommunication.h"
 
 #import "OmahaXMLRequest.h"
 #import "OmahaXMLParser.h"
 
+// TODO: turn this string to a command-line flag
 static NSString* const omahaURLPath =
     @"https://tools.google.com/service/update2";
 
 @interface NSURLSession ()
 - (NSURLSessionDataTask*)dataTaskWithRequest:(NSURLRequest*)request
                            completionHandler:
                                (void (^)(NSData* data,
                                          NSURLResponse* response,
                                          NSError* error))completionHandler;
 @end
 
 @implementation OmahaCommunication
 
 @synthesize requestXMLBody = requestXMLBody_;
 @synthesize delegate = delegate_;
 
 - (id)init {
   return [self initWithBody:[OmahaXMLRequest createXMLRequestBody]];
 }
 
 - (id)initWithBody:(NSXMLDocument*)xmlBody {
   if ((self = [super init])) {
     requestXMLBody_ = xmlBody;
   }
   return self;
 }
 
 - (void)fetchDownloadURLs {
-  // TODO: turn this string to a command-line flag
+  // Forming the request
   NSURL* requestURL = [NSURL URLWithString:omahaURLPath];
   NSMutableURLRequest* request =
       [NSMutableURLRequest requestWithURL:requestURL];
   [request addValue:@"text/xml" forHTTPHeaderField:@"Content-Type"];
   NSData* requestBody =
       [[requestXMLBody_ XMLString] dataUsingEncoding:NSUTF8StringEncoding];
   request.HTTPBody = requestBody;
   request.HTTPMethod = @"POST";
+  // Sending the request
   [[[NSURLSession sharedSession]
       dataTaskWithRequest:request
         completionHandler:^(NSData* data, NSURLResponse* response,
                             NSError* error) {
           NSArray* completeURLs = nil;
           if (!error) {
             completeURLs = [OmahaXMLParser parseXML:data error:&error];
           }
           // Deals with errors both from the network error and the
           // parsing error, as the user only needs to know there was a problem
           // talking with the Google Update server.
           if (error) {
-            [delegate_ onOmahaFailureWithError:error];
+            [delegate_ omahaCommunication:self onOmahaFailureWithError:error];
           } else {
-            [delegate_ onOmahaSuccessWithURLs:completeURLs];
+            [delegate_ omahaCommunication:self
+                   onOmahaSuccessWithURLs:completeURLs];
           }
         }] resume];
 }
 
 @end