Fix a parameter type in NativeNetworkingAndroidSpec

Summary:
`responseType` should be a string, not an Object (which gets converted to a NativeMap by TM).

Changelog: [General] [Fixed] Fix the flow type for NativeNetworkingModule

Reviewed By: fkgozali

Differential Revision: D18019418

fbshipit-source-id: 316470ca82241223eafb5b05a54fc2bbf3074821

ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeNetworkingAndroidSpec.java

@@ -37,8 +37,8 @@ public abstract class NativeNetworkingAndroidSpec extends ReactContextBaseJavaMo
 
   @ReactMethod
   public abstract void sendRequest(String method, String url, double requestId,
-      ReadableArray headers, ReadableMap data, ReadableMap responseType,
-      boolean useIncrementalUpdates, double timeout, boolean withCredentials);
+      ReadableArray headers, ReadableMap data, String responseType, boolean useIncrementalUpdates,
+      double timeout, boolean withCredentials);
 
   @ReactMethod
   public abstract void addListener(String eventName);