DevTools: move CPUProfileModel.js into the common section of devtools.gypi

TBR=apavlov@chromium.org

Review URL: https://codereview.chromium.org/247293002

git-svn-id: svn://svn.chromium.org/blink/trunk@172132 bbb929c8-8fbe-4397-9dbb-9b2b20218538