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/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 9efb0a3..0c2a24e 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -298,7 +298,7 @@
                               TileMode tileMode,
                               bool convolveAlpha);
 
-    virtual bool onIsEqual(const GrEffectRef&) const SK_OVERRIDE;
+    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
 
     SkISize  fKernelSize;
     float   *fKernel;
@@ -517,7 +517,7 @@
     return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance();
 }
 
-bool GrMatrixConvolutionEffect::onIsEqual(const GrEffectRef& sBase) const {
+bool GrMatrixConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
     const GrMatrixConvolutionEffect& s = CastEffect<GrMatrixConvolutionEffect>(sBase);
     return this->texture(0) == s.texture(0) &&
            fKernelSize == s.kernelSize() &&