Bug 1083092: Data parameter for |mozilla::ipc::SocketIOSendTask| template, r=shawnjohnjr

The data class in |SocketIOSendTask| is now a template parameter, instead
of being hard-coded to |UnixSocketRawData|. The patch also adds soem minor
cleanups to the file.

ipc/unixsocket/UnixSocket.cpp

@@ -555,7 +555,8 @@ UnixSocketConsumer::SendSocketData(UnixSocketRawData* aData)
 
   MOZ_ASSERT(!mIO->IsShutdownOnMainThread());
   XRE_GetIOMessageLoop()->PostTask(
-    FROM_HERE, new SocketIOSendTask<UnixSocketConsumerIO>(mIO, aData));
+    FROM_HERE,
+    new SocketIOSendTask<UnixSocketConsumerIO, UnixSocketRawData>(mIO, aData));
 
   return true;
 }