Using NSOperationQueueDefaultMaxConcurrentOperationCount rather than previously-specified constant (k=4)

AFNetworking/AFHTTPClient.m

@@ -63,8 +63,6 @@ typedef id AFNetworkReachabilityRef;
 
 typedef void (^AFCompletionBlock)(void);
 
-static NSUInteger const kAFHTTPClientDefaultMaxConcurrentOperationCount = 4;
-
 static NSString * AFBase64EncodedStringFromString(NSString *string) {
     NSData *data = [NSData dataWithBytes:[string UTF8String] length:[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
     NSUInteger length = [data length];
@@ -285,7 +283,7 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 #endif
     
     self.operationQueue = [[[NSOperationQueue alloc] init] autorelease];
-	[self.operationQueue setMaxConcurrentOperationCount:kAFHTTPClientDefaultMaxConcurrentOperationCount];
+	[self.operationQueue setMaxConcurrentOperationCount:NSOperationQueueDefaultMaxConcurrentOperationCount];
     
     return self;
 }