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

Patch from Mathias Bynens <mathias@qiwi.be>
BUG=332751

Review URL: https://codereview.chromium.org/131703002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@165449 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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