DevTools: move CPUFlameChartDataProvider to CPUProfileFlameChart.js

No code has changed.

R=yurys@chromium.org

Review URL: https://codereview.chromium.org/260333002

git-svn-id: svn://svn.chromium.org/blink/trunk@172858 bbb929c8-8fbe-4397-9dbb-9b2b20218538