Auto-compare GrProcessors' texture accesses in isEqual().

R=joshualitt@google.com

Review URL: https://codereview.chromium.org/654313002
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 95cf85e..03c50e4 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -450,8 +450,7 @@
 
 bool GrMorphologyEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrMorphologyEffect& s = sBase.cast<GrMorphologyEffect>();
-    return (this->texture(0) == s.texture(0) &&
-            this->radius() == s.radius() &&
+    return (this->radius() == s.radius() &&
             this->direction() == s.direction() &&
             this->type() == s.type());
 }