[StyleBuilder] Make top/right/bottom/left properties readonly. To do this we need to introduce the builder for the menu-list popup, and clone the original style, instead of mutating it. There should be no behaviour change. Bug: 1377295 Change-Id: Ic1f940d513246984a2c874be986b2063712d7d16 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3988190 Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org> Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org> Cr-Commit-Position: refs/heads/main@{#1064929}
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