change SkStreams to work with sk_sp<SkData> instead of SkData*

src/pathops/SkPathOpsOp.cpp

Index: src/pathops/SkPathOpsOp.cpp
diff --git a/src/pathops/SkPathOpsOp.cpp b/src/pathops/SkPathOpsOp.cpp
index 9472594b4a7e29f7fc045a5235feeb6e845b3cf4..b7a48b0510c39f525ff076d6fe06ec1d35f4a232 100644
--- a/src/pathops/SkPathOpsOp.cpp
+++ b/src/pathops/SkPathOpsOp.cpp
@@ -206,7 +206,7 @@ static const bool gOutInverse[kReverseDifference_SkPathOp + 1][2][2] = {
 static void dump_path(FILE* file, const SkPath& path, bool force, bool dumpAsHex) {
     SkDynamicMemoryWStream wStream;
     path.dump(&wStream, force, dumpAsHex);
-    sk_sp<SkData> data(wStream.copyToData());
+    sk_sp<SkData> data(wStream.detachAsData());
     fprintf(file, "%.*s\n", (int) data->size(), data->data());
 }