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Normally, the paste popup is hidden when its position changes. However, there
are legitimate cases outside of scrolling where the position may change, e.g.,
due to a resize, where the popup should remain visible. Handle this case by
only hiding the popup if its position changes while scrolling.

BUG=380084

Review URL: https://codereview.chromium.org/312293002

Cr-Commit-Position: refs/heads/master@{#288404}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288404 0039d316-1c4b-4281-b951-d872f2087c98