Don't leak fragment processor in SkColorFilter::asFragmentProcessors implementations.

src/effects/SkColorCubeFilter.cpp

Index: src/effects/SkColorCubeFilter.cpp
diff --git a/src/effects/SkColorCubeFilter.cpp b/src/effects/SkColorCubeFilter.cpp
index 253d2877596946a72899c83cc79648e7c3d0e0b2..8347a9e80f3f71f3fec45db926f9215f8e60c4b1 100644
--- a/src/effects/SkColorCubeFilter.cpp
+++ b/src/effects/SkColorCubeFilter.cpp
@@ -365,6 +365,9 @@ bool SkColorCubeFilter::asFragmentProcessors(GrContext* context,
     if (frag) {
         if (array) {
             *array->append() = frag;
+        } else {
+            frag->unref();
+            SkDEBUGCODE(frag = NULL;)
         }
         return true;
     }