Convert some transition tests to use the pause API, and more cleanup
Created attachment 91154 [details]
Attachment 91154 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'LayoutTests/ChangeLog', u'LayoutTests/anim..." exit_code: 1
LayoutTests/ChangeLog:23: Line contains tab character. [whitespace/tab] 
Total errors found: 1 in 18 files
If any of these errors are false positives, please file a bug against check-webkit-style.