Revert of WebP: Regression test for incremental decoding (https://codereview.chromium.org/255523004/)

Reason for revert:
Inappropriate test data.


Original issue's description:
> WebP: Regression test for incremental decoding
> 
> Add a test for http://crbug.com/364830
> 
> BUG=364830
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=172569

TBR=noel@chromium.org,urvang@google.com
NOTREECHECKS=true
NOTRY=true
BUG=364830

Review URL: https://codereview.chromium.org/256613003

git-svn-id: svn://svn.chromium.org/blink/trunk@172714 bbb929c8-8fbe-4397-9dbb-9b2b20218538