Migrate mac installer to delegate-driven model

chrome/installer/mac/app/NetworkCommunication.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 <Foundation/Foundation.h>
-
 #import "NetworkCommunication.h"
 
 @implementation NetworkCommunication : NSObject
 
 @synthesize session = session_;
 @synthesize request = request_;
-@synthesize dataResponseHandler = dataResponseHandler_;
-@synthesize downloadResponseHandler = downloadResponseHandler_;
 
 - (id)init {
   return [self initWithDelegate:nil];
 }
 
 - (id)initWithDelegate:(id)delegate {
   if ((self = [super init])) {
     NSURLSessionConfiguration* sessionConfig =
         [NSURLSessionConfiguration defaultSessionConfiguration];
     session_ = [NSURLSession sessionWithConfiguration:sessionConfig
                                              delegate:delegate
                                         delegateQueue:nil];
   }
   return self;
 }
 
 - (NSMutableURLRequest*)createRequestWithUrlAsString:(NSString*)urlString
                                           andXMLBody:(NSXMLDocument*)body {
   NSURL* requestURL = [NSURL URLWithString:urlString];
   request_ = [NSMutableURLRequest requestWithURL:requestURL];
   if (body) {
     [request_ addValue:@"text/xml" forHTTPHeaderField:@"Content-Type"];
     NSData* requestBody =
         [[body XMLString] dataUsingEncoding:NSUTF8StringEncoding];
     request_.HTTPBody = requestBody;
   }
   return request_;
 }
 
-- (void)sendDataRequestWithCompletionHandler:
-    (DataTaskCompletionHandler)completionHandler {
-  dataResponseHandler_ = completionHandler;
-  NSURLSessionDataTask* dataTask =
-      [session_ dataTaskWithRequest:request_
-                  completionHandler:dataResponseHandler_];
-
+- (void)sendDataRequest {
+  NSURLSessionDataTask* dataTask = [session_ dataTaskWithRequest:request_];
   [dataTask resume];
 }
 
 - (void)sendDownloadRequest {
-  NSURLSessionDownloadTask* downloadTask;
-  if (downloadResponseHandler_) {
-    downloadTask = [session_ downloadTaskWithRequest:request_
-                                   completionHandler:downloadResponseHandler_];
-  } else {
-    downloadTask = [session_ downloadTaskWithRequest:request_];
-  }
+  NSURLSessionDownloadTask* downloadTask =
+      [session_ downloadTaskWithRequest:request_];
   [downloadTask resume];
 }
 
 @end