Mark usb/usbDevice-iframe.html as timeout
Mark usb/usbDevice-iframe.html as timeout

This test has been failing on all bots.

TBR=iclelland@chromium.org,stanisc@chromium.org
BUG=610567

Review-Url: https://codereview.chromium.org/1963043002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#392549}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk