Switch GrEffect::onIsEqual signature back to GrEffect from GrEffectRef.

R=robertphillips@google.com
Review URL: https://codereview.appspot.com/7188046

git-svn-id: http://skia.googlecode.com/svn/trunk@7326 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkTwoPointRadialGradient.cpp b/src/effects/gradients/SkTwoPointRadialGradient.cpp
index b1c1303..4eaf487 100644
--- a/src/effects/gradients/SkTwoPointRadialGradient.cpp
+++ b/src/effects/gradients/SkTwoPointRadialGradient.cpp
@@ -451,7 +451,7 @@
     typedef GrGLRadial2Gradient GLEffect;
 
 private:
-    virtual bool onIsEqual(const GrEffectRef& sBase) const SK_OVERRIDE {
+    virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE {
         const GrRadial2Gradient& s = CastEffect<GrRadial2Gradient>(sBase);
         return (INHERITED::onIsEqual(sBase) &&
                 this->fCenterX1 == s.fCenterX1 &&