Use case

Recently, #167829 introduced MediaQuery.heightOf and MediaQuery.widthOf methods. After checking the Flutter repo, I noticed that 14 out of 28 calls to sizeOf use just one dimension.

Proposal

I'd like to propose the following:

1. Replace MediaQuery.sizeOf(context).height with MediaQuery.heightOf(context)
2. Replace MediaQuery.sizeOf(context).width with MediaQuery.widthOf(context)