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I frequently use the overrides tab in Chrome Developer tools to emulate other device such IPhone and IPad, but after upgrading to last version (32.0.1700.76 m) everything in the overrides tab is gone and replaced by a checkbox saying "Show 'Emulation' view in console drawer".
Checking this checkbox does not enable a 'Emulation' view in the Console drawer. The "Show Console" button seems to be disabled.
After installing Chrome (or the bleeding edge version Chrome Canary) you should be able to do proper mobile emulation within Chrome's Developer Tools. I usually activate them by Right Clicking > Inspect Element
For visual learners like myself, I just included a full screenshot.