switch colorfilters to sk_sp

src/effects/SkDropShadowImageFilter.cpp

Index: src/effects/SkDropShadowImageFilter.cpp
diff --git a/src/effects/SkDropShadowImageFilter.cpp b/src/effects/SkDropShadowImageFilter.cpp
index e2e72c1097478c39a691cd63d1b2159152340a2a..74e0f0fd35b24a012ebeacd5cf6d81a0f3fc9373 100644
--- a/src/effects/SkDropShadowImageFilter.cpp
+++ b/src/effects/SkDropShadowImageFilter.cpp
@@ -79,11 +79,10 @@ bool SkDropShadowImageFilter::onFilterImageDeprecated(Proxy* proxy, const SkBitm
     sigma.fX = SkMaxScalar(0, sigma.fX);
     sigma.fY = SkMaxScalar(0, sigma.fY);
     SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(sigma.fX, sigma.fY));
-    SkAutoTUnref<SkColorFilter> colorFilter(
-        SkColorFilter::CreateModeFilter(fColor, SkXfermode::kSrcIn_Mode));
+    auto colorFilter(SkColorFilter::MakeModeFilter(fColor, SkXfermode::kSrcIn_Mode));
     SkPaint paint;
     paint.setImageFilter(blurFilter.get());
-    paint.setColorFilter(colorFilter.get());
+    paint.setColorFilter(colorFilter);

[f(malita), 2016/03/21 22:24:19]

std::move colorFilter (or inline factory).

[reed1, 2016/03/22 13:47:10]

Done.

     paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
     SkVector offsetVec = SkVector::Make(fDx, fDy);
     ctx.ctm().mapVectors(&offsetVec, 1);