Remove macros that make it look like it's a good idea to not be able to flatten.

src/core/SkDraw.cpp

Index: src/core/SkDraw.cpp
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index 0a6365c335fc7e5fe421e69701d7d65a83214279..1e1ce0763155f11461f6269e72e0ca17a114641f 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -2035,7 +2035,9 @@ public:
     };
 
     SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_NOT_FLATTENABLE_PROCS(SkTriColorShader)
+
+    // For serialization.  This will never be called.
+    Factory getFactory() const SK_OVERRIDE { sk_throw(); return NULL; }
 
 protected:
     virtual Context* onCreateContext(const ContextRec& rec, void* storage) const SK_OVERRIDE {