DevTools: Add UA presets for Opera 12 on Win/Mac
DevTools: Add UA presets for Opera 12 on Win/Mac

Patch from Mathias Bynens <mathiasb@opera.com>
BUG=336383

Review URL: https://codereview.chromium.org/143893003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@165655 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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