views: Remove GetHeightForWidth in //ash/app_list.

Because both GetHeightForWidth and CalculatePreferredSize can provide
calculation options for preferred size calculation, but in some cases we
have to calculate both. Their coexistence also leads to some
implementation differences. In fact, we can merge them through
CalculatePreferredSize(views::SizeBounds).

Now is the stage to delete the GetHeightForWidth overload.

Bug: 40232718
Change-Id: Ia417ece7912c9873e31e6903f715540185d174f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5741359
Reviewed-by: Matthew Mourgos <mmourgos@chromium.org>
Commit-Queue: Weidong Liu <weidongliu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1335205}