Move LayoutMenuList's height calculation logic to styleDidChange method as we need to recalculate the height if the page zoom is changed.

BUG=624269
TEST=LayoutTests/transforms/2d/zoom-menulist.html

Review-Url: https://codereview.chromium.org/2108043003
Cr-Commit-Position: refs/heads/master@{#403248}
4 files changed