(HTMLDivElementImp): Clean up
(HTMLElementImp::getAttributeAsUnsigned, HTMLElementImp::setAttributeAsUnsigned): New
[HTML] Remove the dependency on HTMLElementImp::eval(); patch 13

(HTMLInputElementImp::handleMutation): Refine
(HTMLInputElementImp::eval): Remove
(HTMLInputElementImp::getStyle, HTMLInputElementImp::updateStyle): New
(HTMLInputElementImp::getHeight, HTMLInputElementImp::setHeight): Add more details
(HTMLInputElementImp::getSize, HTMLInputElementImp::setSize): Add more details
(HTMLInputElementImp::getWidth, HTMLInputElementImp::setWidth): Add more details