Remove uses of GrAutoScratchTexture.

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 59768fc15879ad036998045bbf46daa54068579b..5e9a1a393be6a9221922f5d01f6ce5c5e3446ed2 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -414,11 +414,12 @@ bool SkDisplacementMapEffect::filterImageGPU(Proxy* proxy, const SkBitmap& src,
     desc.fHeight = bounds.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());