Remove GrContext from SkXfermode::[Aa]sNewEffectOrCoeff() and all subclasses,

src/core/SkXfermode_proccoeff.h

 #ifndef SkXfermode_proccoeff_DEFINED
 #define SkXfermode_proccoeff_DEFINED
 
 #include "SkXfermode.h"
 #include "SkFlattenableBuffers.h"
 
 struct ProcCoeff {
     SkXfermodeProc      fProc;
     SkXfermode::Coeff   fSC;
     SkXfermode::Coeff   fDC;
@@ skipping 11 matching lines @@
         // these may be valid, or may be CANNOT_USE_COEFF
         fSrcCoeff = rec.fSC;
         fDstCoeff = rec.fDC;
     }
 
     virtual bool asMode(Mode* mode) const SK_OVERRIDE;
 
     virtual bool asCoeff(Coeff* sc, Coeff* dc) const SK_OVERRIDE;
 
 #if SK_SUPPORT_GPU
-    virtual bool asNewEffectOrCoeff(GrContext*,
-                                    GrEffectRef** effect,
+    virtual bool asNewEffectOrCoeff(GrEffectRef** effect,
                                     Coeff* src,
                                     Coeff* dst,
                                     GrTexture* background) const SK_OVERRIDE;
 #endif
 
     SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
 
 protected:
     SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
@@ skipping 14 matching lines @@
     }
 
 private:
     Mode    fMode;
     Coeff   fSrcCoeff, fDstCoeff;
 
     typedef SkProcXfermode INHERITED;
 };
 
 #endif // #ifndef SkXfermode_proccoeff_DEFINED