Avoid dispatching network callbacks when already on the right queue

Reviewed By: mmmulani

Differential Revision: D3690133

fbshipit-source-id: a1769016a05b3163a3b1c93f448864aeaecc6e46

Libraries/Network/RCTHTTPRequestHandler.m

@@ -9,6 +9,8 @@
 
 #import "RCTHTTPRequestHandler.h"
 
+#import "RCTNetworking.h"
+
 @interface RCTHTTPRequestHandler () <NSURLSessionDataDelegate>
 
 @end
@@ -19,6 +21,8 @@
   NSURLSession *_session;
 }
 
+@synthesize bridge = _bridge;
+
 RCT_EXPORT_MODULE()
 
 - (void)invalidate
@@ -55,6 +59,7 @@ RCT_EXPORT_MODULE()
 
     NSOperationQueue *callbackQueue = [NSOperationQueue new];
     callbackQueue.maxConcurrentOperationCount = 1;
+    callbackQueue.underlyingQueue = [[_bridge networking] methodQueue];
     NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
     _session = [NSURLSession sessionWithConfiguration:configuration
                                              delegate:self