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The bug was introduced by https://crrev.com/c/2542925 The problem is:
the contents view's insets are ignored when setting a menu item's
height. To solve this bug, all constants related to multipaste menu
views are grouped in one file. It increases the code readability.

Bug: 1154070
Change-Id: Ie44ecf40afd1796ce6d18ccd8be921c29ee79199
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566448Reviewed-by: David Black <dmblack@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832513}