Small improvements to RenderBox/LayoutUnit casting in MathML

[Frédéric Wang (:fredw)]

This is a small follow-up of the ​RenderMathMLRow/​RenderMathMLUnderOver/​RenderMathMLFraction refactoring. Since these MathML renderers can only contain other MathML renderers, we can just considerer RenderBox children and prevent unnecessary casts. Similarly, when the two arguments of std::max are LayoutUnit's, we do not need to specialize to std::max<LayoutUnit>.

[Frédéric Wang (:fredw)]

Created attachment 279480 [details]
Patch

[Darin Adler]

Comment on attachment 279480 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=279480&action=review

> Source/WebCore/rendering/mathml/RenderMathMLUnderOver.cpp:58
> +    RenderBox* base = firstChildBox();

Typically in new code, we would use auto* here instead of writing RenderBox*.

> Source/WebCore/rendering/mathml/RenderMathMLUnderOver.cpp:78
> +    for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {

Ditto.

[Frédéric Wang (:fredw)]

https://trac.webkit.org/changeset/201418