v1 UI and v2 UI should share statistics.js

v1 UI and v2 UI should share statistics.js
https://bugs.webkit.org/show_bug.cgi?id=154262

Reviewed by Chris Dumez.

Share statistics.js between v1 and v2 UI.

* public/index.html:
* public/js/shared.js: Deleted.
* public/js/statistics.js: Removed.
* public/shared: Added.
* public/shared/statistics.js: Moved from Websites/perf.webkit.org/public/v2/js/statistics.js.
* public/v2/index.html:
* public/v2/js/statistics.js: Removed.
* public/v3/index.html:
* tools/detect-changes.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@196605 268f45cc-cd09-0410-ab3c-d52691b4dbfc