Revert 180027 "Mark test as needing rebaseline after Skia change..."

A reftest cannot be marked as NeedsRebaseline/NeedsManualRebaseline.
This caused lint errors on all bots.

> Mark test as needing rebaseline after Skia change improves it.
> 
> virtual/gpu/fast/canvas/canvas-createImageBitmap-colorClamping.html is less dirty after Skia change.
> 

TBR=bungeman@chromium.org,zerny@chromium.org

Review URL: https://codereview.chromium.org/463703004

git-svn-id: svn://svn.chromium.org/blink/trunk@180030 bbb929c8-8fbe-4397-9dbb-9b2b20218538