[DataGrid] Do not make columns thinner if width constraint is invalid.
[DataGrid] Do not make columns thinner if width constraint is invalid.

Most of time DataGrid columns are constrained to be no thinner (pixel width) than some constant.

But when user resizes table, then width is reduced proportionally.

So it may come that some divider is placed between two thin columns.

BUG=226957

Review URL: https://codereview.chromium.org/13423006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@147616 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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