Allow toString capability to be toggled independent of developer mode

src/core/SkXfermode_proccoeff.h

 #ifndef SkXfermode_proccoeff_DEFINED
 #define SkXfermode_proccoeff_DEFINED
 
 #include "SkXfermode.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
 struct ProcCoeff {
     SkXfermodeProc      fProc;
     SkXfermode::Coeff   fSC;
@@ skipping 10 matching lines @@
 
     virtual bool asMode(Mode* mode) const SK_OVERRIDE;
 
     virtual bool asCoeff(Coeff* sc, Coeff* dc) const SK_OVERRIDE;
 
 #if SK_SUPPORT_GPU
     virtual bool asNewEffect(GrEffectRef** effect,
                              GrTexture* background) const SK_OVERRIDE;
 #endif
 
-    SK_DEVELOPER_TO_STRING()
+    SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
 
 protected:
     SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode)
             : INHERITED(rec.fProc) {
         fMode = mode;
         // these may be valid, or may be CANNOT_USE_COEFF
         fSrcCoeff = rec.fSC;
         fDstCoeff = rec.fDC;
     }
 
     SkProcCoeffXfermode(SkReadBuffer& buffer);
 
     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE;
 
     Mode getMode() const {
         return fMode;
     }
 
 private:
     Mode    fMode;
     Coeff   fSrcCoeff, fDstCoeff;
 
     typedef SkProcXfermode INHERITED;
 };
 
 #endif // #ifndef SkXfermode_proccoeff_DEFINED