use Make instead of Create to return a shared shader

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 15d461960dd8f6b97230d989bbce7d497bc7b660..8ad120991d5176c64fb2439dc823eb76082a48a0 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -78,8 +78,8 @@ SkFlattenable* SkLinearGradient::CreateProc(SkReadBuffer& buffer) {
     SkPoint pts[2];
     pts[0] = buffer.readPoint();
     pts[1] = buffer.readPoint();
-    return SkGradientShader::CreateLinear(pts, desc.fColors, desc.fPos, desc.fCount,
-                                          desc.fTileMode, desc.fGradFlags, desc.fLocalMatrix);
+    return SkGradientShader::MakeLinear(pts, desc.fColors, desc.fPos, desc.fCount, desc.fTileMode,
+                                        desc.fGradFlags, desc.fLocalMatrix).release();
 }
 
 void SkLinearGradient::flatten(SkWriteBuffer& buffer) const {
@@ -430,9 +430,7 @@ const GrFragmentProcessor* GrLinearGradient::TestCreate(GrProcessorTestData* d)
     SkScalar* stops = stopsArray;
     SkShader::TileMode tm;
     int colorCount = RandomGradientParams(d->fRandom, colors, &stops, &tm);
-    SkAutoTUnref<SkShader> shader(SkGradientShader::CreateLinear(points,
-                                                                 colors, stops, colorCount,
-                                                                 tm));
+    auto shader = SkGradientShader::MakeLinear(points, colors, stops, colorCount, tm);
     const GrFragmentProcessor* fp = shader->asFragmentProcessor(d->fContext,
         GrTest::TestMatrix(d->fRandom), NULL, kNone_SkFilterQuality);
     GrAlwaysAssert(fp);