Revert "Revert 177666 "DevTools: Make the "common" module window- and DO...""

This reverts commit 8c91ee4ca904b2701c2557cccc3edd8ce99d9604 (r177731).

ParseCapabilities.MobileEmulationDeviceName relies on data retrieved from
the Chrome DevTools (Blink-side) frontend JavaScript source code.
http://crbug.com/392430 has been filed and the test disabled
in http://crrev.com/282007.

TBR=yutak@chromium.org
BUG=391566
NOTRY=true
NOTREECHECK=true

Review URL: https://codereview.chromium.org/377243002

git-svn-id: svn://svn.chromium.org/blink/trunk@177737 bbb929c8-8fbe-4397-9dbb-9b2b20218538