fixing GrBatch leak

src/gpu/GrAAHairLinePathRenderer.cpp

Index: src/gpu/GrAAHairLinePathRenderer.cpp
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index d2113cacc2d49f451b97052cf5770aef3d294660..cbce6aa4c32248075d5671d4502d52ad9b8a0cc5 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -1058,7 +1058,8 @@ bool GrAAHairLinePathRenderer::onDrawPath(GrDrawTarget* target,
     SkDEBUGCODE(geometry.fDevBounds = devRect;)
     geometry.fDevClipBounds = devClipBounds;
 
-    GrBatch* batch = AAHairlineBatch::Create(geometry, fLinesIndexBuffer, fQuadsIndexBuffer);
+    SkAutoTUnref<GrBatch> batch(AAHairlineBatch::Create(geometry, fLinesIndexBuffer,
+                                                        fQuadsIndexBuffer));
     target->drawBatch(pipelineBuilder, batch, &devRect);
 
     return true;