DevTools: Combine frontend modules deployment into their own targets

This simplifies the gyp code readability

R=pfeldman@chromium.org, pfeldman

Review URL: https://codereview.chromium.org/249273003

git-svn-id: svn://svn.chromium.org/blink/trunk@172628 bbb929c8-8fbe-4397-9dbb-9b2b20218538