Remove useless parameter to the function removeVnodes

[lessfish]

What problem does this feature solve?

The first parameter of function removeVnodes is useless, remove it to cut down the code

the function is https://github.com/vuejs/vue/blob/dev/src/core/vdom/patch.js#L361

What does the proposed API look like?

Remove the first parameter parentElm of the function removeVnodes, and remove the place which calls the function as well

[raphaelkieling]

It's true, but strange... on all calls has a parentElm different

[lessfish]

@raphaelkieling I wonder if all of them are useless .. or in another use?