Remove uses of GrAutoScratchTexture.

src/effects/SkXfermodeImageFilter.cpp

Index: src/effects/SkXfermodeImageFilter.cpp
diff --git a/src/effects/SkXfermodeImageFilter.cpp b/src/effects/SkXfermodeImageFilter.cpp
index bca5223db4cfa24446ba99c6cbb03f4454eb407c..a50978e39ba4a559765fd862b3481f6582eac756 100644
--- a/src/effects/SkXfermodeImageFilter.cpp
+++ b/src/effects/SkXfermodeImageFilter.cpp
@@ -139,13 +139,11 @@ bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
     desc.fWidth = src.width();
     desc.fHeight = src.height();
     desc.fConfig = kSkia8888_GrPixelConfig;
-
-    GrAutoScratchTexture ast(context, desc);
-    if (NULL == ast.texture()) {
+    SkAutoTUnref<GrTexture> dst(
+        context->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));
+    if (!dst) {
         return false;
     }
-    SkAutoTUnref<GrTexture> dst(ast.detach());
-
     GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
 
     if (!fMode || !fMode->asFragmentProcessor(&xferProcessor, backgroundTex)) {