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

tests/AnnotationTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkAnnotation.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkDocument.h"
@@ skipping 33 matching lines @@
     sk_sp<SkDocument> doc(SkDocument::MakePDF(&outStream));
     SkCanvas* canvas = doc->beginPage(612.0f, 792.0f);
     REPORTER_ASSERT(reporter, canvas);
 
     SkRect r = SkRect::MakeXYWH(SkIntToScalar(72), SkIntToScalar(72),
                                 SkIntToScalar(288), SkIntToScalar(72));
     sk_sp<SkData> data(SkData::MakeWithCString("http://www.gooogle.com"));
     SkAnnotateRectWithURL(canvas, r, data.get());
 
     REPORTER_ASSERT(reporter, doc->close());
-    sk_sp<SkData> out(outStream.copyToData());
+    sk_sp<SkData> out = outStream.detachAsData();
     const char* rawOutput = (const char*)out->data();
 
     REPORTER_ASSERT(reporter, ContainsString(rawOutput, out->size(), "/Annots "));
 }
 
 DEF_TEST(Annotation_NamedDestination, reporter) {
     REQUIRE_PDF_DOCUMENT(Annotation_NamedDestination, reporter);
     SkDynamicMemoryWStream outStream;
     sk_sp<SkDocument> doc(SkDocument::MakePDF(&outStream));
     SkCanvas* canvas = doc->beginPage(612.0f, 792.0f);
     REPORTER_ASSERT(reporter, canvas);
 
     SkPoint p = SkPoint::Make(SkIntToScalar(72), SkIntToScalar(72));
     sk_sp<SkData> data(SkData::MakeWithCString("example"));
     SkAnnotateNamedDestination(canvas, p, data.get());
 
     REPORTER_ASSERT(reporter, doc->close());
-    sk_sp<SkData> out(outStream.copyToData());
+    sk_sp<SkData> out = outStream.detachAsData();
     const char* rawOutput = (const char*)out->data();
 
     REPORTER_ASSERT(reporter,
         ContainsString(rawOutput, out->size(), "/example "));
 }