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/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index bef29c0..e239530 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -393,7 +393,7 @@
     typedef GrGLConical2Gradient GLEffect;
 
 private:
-    virtual bool onIsEqual(const GrEffectRef& sBase) const SK_OVERRIDE {
+    virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE {
         const GrConical2Gradient& s = CastEffect<GrConical2Gradient>(sBase);
         return (INHERITED::onIsEqual(sBase) &&
                 this->fCenterX1 == s.fCenterX1 &&