disable chatting debugf

src/effects/SkColorFilters.cpp

Index: src/effects/SkColorFilters.cpp
diff --git a/src/effects/SkColorFilters.cpp b/src/effects/SkColorFilters.cpp
index 6f7d6886f815d6618725bd55cafe68c0fe788f35..8bcd0ebc5d67d96acf3d94149a744e30fd23f292 100644
--- a/src/effects/SkColorFilters.cpp
+++ b/src/effects/SkColorFilters.cpp
@@ -135,7 +135,7 @@ public:
         // conversion here.
         SkXfermode::Coeff srcCoeff, dstCoeff;
         if (!SkXfermode::ModeAsCoeff(mode, &srcCoeff, &dstCoeff)) {
-            SkDebugf("Failing to create color filter for mode %d\n", mode);
+//            SkDebugf("Failing to create color filter for mode %d\n", mode);
             return NULL;
         }
         return SkNEW_ARGS(ModeColorFilterEffect, (c, mode));