Get rid of Gradient::getColor()
https://bugs.webkit.org/show_bug.cgi?id=116089

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-05-14
Reviewed by Andreas Kling.

This code is now useless, remove it.

* html/canvas/CanvasGradient.h:
(CanvasGradient):
* platform/graphics/Gradient.cpp:
(WebCore::Gradient::Gradient):
(WebCore::Gradient::hash):
* platform/graphics/Gradient.h:
(Gradient):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150088 268f45cc-cd09-0410-ab3c-d52691b4dbfc