Revert of more shader-->sp conversions

gm/matrixconvolution.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColor.h"
 #include "SkMatrixConvolutionImageFilter.h"
@@ skipping 19 matching lines @@
         canvas.clear(0x00000000);
         SkPaint paint;
         paint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&paint);
         paint.setColor(0xFFFFFFFF);
         paint.setTextSize(SkIntToScalar(180));
         SkPoint pts[2] = { SkPoint::Make(0, 0),
                            SkPoint::Make(0, SkIntToScalar(80)) };
         SkColor colors[2] = { 0xFFFFFFFF, 0x40404040 };
         SkScalar pos[2] = { 0, SkIntToScalar(80) };
-        paint.setShader(SkGradientShader::MakeLinear(
-            pts, colors, pos, 2, SkShader::kClamp_TileMode));
+        paint.setShader(SkGradientShader::CreateLinear(
+            pts, colors, pos, 2, SkShader::kClamp_TileMode))->unref();
         const char* str = "e";
         canvas.drawText(str, strlen(str), SkIntToScalar(-10), SkIntToScalar(80), paint);
     }
 
     SkISize onISize() override {
         return SkISize::Make(500, 300);
     }
 
     void draw(SkCanvas* canvas, int x, int y, const SkIPoint& kernelOffset,
               SkMatrixConvolutionImageFilter::TileMode tileMode, bool convolveAlpha,
@@ skipping 56 matching lines @@
     SkBitmap fBitmap;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new MatrixConvolutionGM;)
 
 }