mac: Rename the method -layout in MCSettingsButtonCell.
mac: Rename the method -layout in MCSettingsButtonCell.

-layout is the name of a method on NSView that performs constraint based
layout. The new method's name is -layoutEntryView.

BUG=471823

Review URL: https://codereview.chromium.org/1114743002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#327525}

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