Explicitly set RCTWebSocketModule's methodQueue

Summary:
@public
It seems no one was setting this. Also couldn't find the RCTBlobModule.

Changelog: [iOS] [Fixed] - Set RCTWebSocketModule's methodQueue

Reviewed By: fkgozali

Differential Revision: D17964367

fbshipit-source-id: b2e2bde31dce4a35ff60163c5a31c3d64fcd9024

Libraries/WebSocket/RCTWebSocketModule.m

@@ -40,8 +40,10 @@
 
 RCT_EXPORT_MODULE()
 
-// Used by RCTBlobModule
-@synthesize methodQueue = _methodQueue;
+- (dispatch_queue_t)methodQueue
+{
+  return dispatch_get_main_queue();
+}
 
 - (NSArray *)supportedEvents
 {
@@ -82,7 +84,7 @@ RCT_EXPORT_METHOD(connect:(NSURL *)URL protocols:(NSArray *)protocols options:(N
   }];
 
   RCTSRWebSocket *webSocket = [[RCTSRWebSocket alloc] initWithURLRequest:request protocols:protocols];
-  [webSocket setDelegateDispatchQueue:_methodQueue];
+  [webSocket setDelegateDispatchQueue:[self methodQueue]];
   webSocket.delegate = self;
   webSocket.reactTag = socketID;
   if (!_sockets) {