HTMLImageElement::handle_event should use a for loop

[Ms2ger]

Code: components/script/dom/htmlimageelement.rs

It uses

           let mut index = 0;
           while index < elements.len() {
               // Use elements[index]
               index += 1;
           }

I don't see any reason it can't use for element in elements {}

Doesn't need a test; if it compiles, that's good enough.

[highfive]

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[hgallagher1993]

I'll take this @highfive: assign me

[highfive]

Hey @hgallagher1993! Thanks for your interest in working on this issue. It's now assigned to you!

[snehasi]

@highfive assign me

[highfive]

It looks like this has already been assigned to someone. I'll leave the decision to a core contributor.