Fix Ember.js warnings the new perf dashboard

Fix Ember.js warnings the new perf dashboard
https://bugs.webkit.org/show_bug.cgi?id=138531

Reviewed by Darin Adler.

Fixed various warnings.

* public/v2/app.js:
(App.InteractiveChartComponent._relayoutDataAndAxes): We can't use "rem". Use this._rem as done for x.
* public/v2/data.js:
(PrivilegedAPI._post): Removed the superfluous console.log.
(CommitLogs.fetchForTimeRange): Ditto.
* public/v2/index.html: Added tbody as required by the HTML specification.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@175786 268f45cc-cd09-0410-ab3c-d52691b4dbfc