DevTools: Forbid selection of button[is="text-button"] captions
DevTools: Forbid selection of button[is="text-button"] captions

R=lushnikov
BUG=450537
NOTRY=true

Review URL: https://codereview.chromium.org/861123002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188728 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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