AnalysisResultsViewer never uses this._smallerIsBetter

AnalysisResultsViewer never uses this._smallerIsBetter
https://bugs.webkit.org/show_bug.cgi?id=154134

Reviewed by Chris Dumez.

Removed the unused instance variable _smallerIsBetter from AnalysisResultsViewer and TestGroupStackingBlock.

* public/v3/components/analysis-results-viewer.js:
(AnalysisResultsViewer): Removed the unused _smallerIsBetter.
(AnalysisResultsViewer.prototype.setSmallerIsBetter): Deleted.
(AnalysisResultsViewer.prototype.buildRowGroups):
(AnalysisResultsViewer.TestGroupStackingBlock): Removed the unused _smallerIsBetter.
* public/v3/pages/analysis-task-page.js:
(AnalysisTaskPage.prototype._didFetchTask):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@196443 268f45cc-cd09-0410-ab3c-d52691b4dbfc