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/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 895dd98..527cc9e 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -258,7 +258,7 @@
     void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
 
 private:
-    virtual bool onIsEqual(const GrEffectRef&) const SK_OVERRIDE;
+    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
 
     GrDisplacementMapEffect(SkDisplacementMapEffect::ChannelSelectorType xChannelSelector,
                             SkDisplacementMapEffect::ChannelSelectorType yChannelSelector,
@@ -361,7 +361,7 @@
 GrDisplacementMapEffect::~GrDisplacementMapEffect() {
 }
 
-bool GrDisplacementMapEffect::onIsEqual(const GrEffectRef& sBase) const {
+bool GrDisplacementMapEffect::onIsEqual(const GrEffect& sBase) const {
     const GrDisplacementMapEffect& s = CastEffect<GrDisplacementMapEffect>(sBase);
     return fDisplacementAccess.getTexture() == s.fDisplacementAccess.getTexture() &&
            fColorAccess.getTexture() == s.fColorAccess.getTexture() &&