Use empty insets for ToolbarIconContainerView

This ignores the insets suggested by the View border to prevent
increasing the preferred size of the view when a border stroke is being
drawn around it.

Bug: None
Change-Id: Ibb3b826f56fac16962487bb8618988fff165553d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666566
Reviewed-by: Siyu An <siyua@chromium.org>
Commit-Queue: Siyu An <siyua@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670684}
2 files changed