Revert of Add flipped gradient branch to two point conical gradient (https://coderevi...

Revert of Add flipped gradient branch to two point conical gradient (https://codereview.chromium.org/227623004/)

Reason for revert:
Breaking all CompareGMs

Original issue's description:
> Add flipped gradient branch to two point conical gradient
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14235

R=bsalomon@google.com, mtklein@google.com
TBR=bsalomon@google.com, mtklein@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/239993006

git-svn-id: http://skia.googlecode.com/svn/trunk@14236 2bbb7eff-a529-9590-31e7-b0007b416f81