DevTools: make device select a popup-based select.
DevTools: make device select a popup-based select.

TBR=vsevik

Review URL: https://codereview.chromium.org/55103003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161078 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs