change more effects to only expose factories

src/effects/SkColorFilters.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitRow.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
@@ skipping 148 matching lines @@
             (0xFF == alpha && SkXfermode::kDstIn_Mode == mode)) {
         return nullptr;
     }
 
     switch (mode) {
         case SkXfermode::kSrc_Mode:
             return new Src_SkModeColorFilter(color);
         case SkXfermode::kSrcOver_Mode:
             return new SrcOver_SkModeColorFilter(color);
         default:
-            return new SkModeColorFilter(color, mode);
+            return SkModeColorFilter::Create(color, mode);
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkScalar byte_to_scale(U8CPU byte) {
     if (0xFF == byte) {
         // want to get this exact
         return 1;
     } else {
         return byte * 0.00392156862745f;
     }
 }
 
 SkColorFilter* SkColorFilter::CreateLightingFilter(SkColor mul, SkColor add) {
     SkColorMatrix matrix;
     matrix.setScale(byte_to_scale(SkColorGetR(mul)),
                     byte_to_scale(SkColorGetG(mul)),
                     byte_to_scale(SkColorGetB(mul)),
                     1);
     matrix.postTranslate(SkIntToScalar(SkColorGetR(add)),
                          SkIntToScalar(SkColorGetG(add)),
                          SkIntToScalar(SkColorGetB(add)),
                          0);
     return SkColorMatrixFilter::Create(matrix);
 }