Update list of trybots used by https://goto.google.com/HowToLandSkiaChangesThatChangeWebkitLayoutTests

TBR=reed
Review URL: https://codereview.appspot.com/6250071

git-svn-id: http://skia.googlecode.com/svn/trunk@4058 2bbb7eff-a529-9590-31e7-b0007b416f81
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