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/gpu/effects/GrTextureDomainEffect.cpp b/src/gpu/effects/GrTextureDomainEffect.cpp
index 58c8b80..bfd62c2 100644
--- a/src/gpu/effects/GrTextureDomainEffect.cpp
+++ b/src/gpu/effects/GrTextureDomainEffect.cpp
@@ -169,7 +169,7 @@
     return GrTBackendEffectFactory<GrTextureDomainEffect>::getInstance();
 }
 
-bool GrTextureDomainEffect::onIsEqual(const GrEffectRef& sBase) const {
+bool GrTextureDomainEffect::onIsEqual(const GrEffect& sBase) const {
     const GrTextureDomainEffect& s = CastEffect<GrTextureDomainEffect>(sBase);
     return this->hasSameTextureParamsAndMatrix(s) && this->fTextureDomain == s.fTextureDomain;
 }