Bug 1626570 - Improve handling of copying arrays in dom/network/. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D73670

dom/network/TCPSocketChild.cpp

@@ -163,9 +163,7 @@ nsresult TCPSocketChild::SendSend(const ArrayBuffer& aData,
     return NS_ERROR_OUT_OF_MEMORY;
   }
 
-  nsTArray<uint8_t> arr;
-  arr.SwapElements(fallibleArr);
-  SendData(arr);
+  SendData(SendableData{std::move(fallibleArr)});
   return NS_OK;
 }
 

dom/network/UDPSocketChild.cpp

@@ -136,10 +136,7 @@ nsresult UDPSocketChild::SendDataInternal(const UDPSocketAddr& aAddr,
     return NS_ERROR_OUT_OF_MEMORY;
   }
 
-  nsTArray<uint8_t> array;
-  array.SwapElements(fallibleArray);
-
-  SendOutgoingData(array, aAddr);
+  SendOutgoingData(UDPData{std::move(fallibleArray)}, aAddr);
 
   return NS_OK;
 }