Merge 199493 "Revert of Enable ServiceWorkerPerformanceTimeline ..."

Merge 199493 "Revert of Enable ServiceWorkerPerformanceTimeline ..."

> Revert of Enable ServiceWorkerPerformanceTimeline flag for stable (patchset #1 id:1 of https://codereview.chromium.org/1203953002/)
> 
> Reason for revert:
> This shipped new prefixed APIs:
> https://groups.google.com/a/chromium.org/d/msg/blink-dev/htsW078UcFA/2cel1auAH60J
> 
> Original issue's description:
> > Enable ServiceWorkerPerformanceTimeline flag for stable
> >
> > This ships User Timing and Resource Timing in Workers, and workerStart
> > attribute of Resource Timing.
> >
> > I think it's safe to enable it now; User Timing and workerStart have
> > landed over 2 weeks ago. Resource Timing part is new, but I only added
> > main thread to worker plumbing on the existing stable implementation.
> >
> > Intent to Implement and Ship:
> > https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/htsW078UcFA
> >
> > BUG=465640, 465641, 465643
> >
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197722
> 
> BUG=465640, 465641, 465643
> 
> Review URL: https://codereview.chromium.org/1254803002

TBR=ksakamoto@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199619

[Kunihiko Sakamoto, 2015-07-29 01:44:45]

Committed patchset #1 (id:1) manually as r199619.