Fix param name in GrEffect::CastEffect

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/376863006
diff --git a/include/gpu/GrEffect.h b/include/gpu/GrEffect.h
index 575e3ea..781a29d 100644
--- a/include/gpu/GrEffect.h
+++ b/include/gpu/GrEffect.h
@@ -169,11 +169,11 @@
         , fWillUseInputColor(true)
         , fHasVertexCode(false) {}
 
-    /** Helper for down-casting to a GrEffect subclass
+    /**
+      * Helper for down-casting to a GrEffect subclass
       */
-    template <typename T>
-    static const T& CastEffect(const GrEffect& effectRef) {
-        return *static_cast<const T*>(&effectRef);
+    template <typename T> static const T& CastEffect(const GrEffect& effect) {
+        return *static_cast<const T*>(&effect);
     }
 
     /**