Migrate mac installer to delegate-driven model

chrome/installer/mac/app/OmahaCommunication.h

Index: chrome/installer/mac/app/OmahaCommunication.h
diff --git a/chrome/installer/mac/app/OmahaCommunication.h b/chrome/installer/mac/app/OmahaCommunication.h
index 54a377f1c8361e71252c7dd8680436e0264ae8ca..f6f0ad1f71842c62a8a3716f8db170bfe334b256 100644
--- a/chrome/installer/mac/app/OmahaCommunication.h
+++ b/chrome/installer/mac/app/OmahaCommunication.h
@@ -7,20 +7,23 @@
 
 #import <Foundation/Foundation.h>
 
-#include "NetworkCommunication.h"
+#import "NetworkCommunication.h"
+#import "MainDelegate.h"
 
-typedef void (^OmahaRequestCompletionHandler)(NSData*, NSError*);
-
-@interface OmahaCommunication : NSObject
+@interface OmahaCommunication : NSObject<NSURLSessionDataDelegate> {
+  NSMutableData* _dataCollected;
+  id<DownloadDelegate> _delegate;
+}
 
 @property(nonatomic, copy) NSXMLDocument* requestXMLBody;
 @property(nonatomic, copy) NetworkCommunication* sessionHelper;
+@property(nonatomic, assign) id<DownloadDelegate> delegate;
 
 - (id)init;
 - (id)initWithBody:(NSXMLDocument*)xmlBody;
 
 // Sends the request created using the session helper.
-- (void)sendRequestWithBlock:(OmahaRequestCompletionHandler)block;
+- (void)sendRequest;
 
 @end