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

tests/PictureTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBigPicture.h"
 #include "SkBBoxHierarchy.h"
 #include "SkBlurImageFilter.h"
@@ skipping 614 matching lines @@
     SkPictureRecorder recorder;
     SkCanvas* canvas = recorder.beginRecording(SkIntToScalar(bitmap.width()),
                                                SkIntToScalar(bitmap.height()));
     canvas->drawBitmap(bitmap, 0, 0);
     sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
 
     SkDynamicMemoryWStream wStream;
     SkAutoTUnref<SkPixelSerializer> serializer(
             SkImageEncoder::CreatePixelSerializer());
     picture->serialize(&wStream, serializer);
-    return sk_sp<SkData>(wStream.copyToData());
+    return wStream.detachAsData();
 }
 
 struct ErrorContext {
     int fErrors;
     skiatest::Reporter* fReporter;
 };
 
 static void assert_one_parse_error_cb(SkError error, void* context) {
     ErrorContext* errorContext = static_cast<ErrorContext*>(context);
     errorContext->fErrors++;
@@ skipping 17 matching lines @@
 }
 
 DEF_TEST(Picture_EncodedData, reporter) {
     // Create a bitmap that will be encoded.
     SkBitmap original;
     make_bm(&original, 100, 100, SK_ColorBLUE, true);
     SkDynamicMemoryWStream wStream;
     if (!SkImageEncoder::EncodeStream(&wStream, original, SkImageEncoder::kPNG_Type, 100)) {
         return;
     }
-    sk_sp<SkData> data(wStream.copyToData());
+    sk_sp<SkData> data = wStream.detachAsData();
 
     SkBitmap bm;
     bool installSuccess = SkDEPRECATED_InstallDiscardablePixelRef(data.get(), &bm);
     REPORTER_ASSERT(reporter, installSuccess);
 
     // Write both bitmaps to pictures, and ensure that the resulting data streams are the same.
     // Flattening original will follow the old path of performing an encode, while flattening bm
     // will use the already encoded data.
     sk_sp<SkData> picture1(serialized_picture_from_bitmap(original));
     sk_sp<SkData> picture2(serialized_picture_from_bitmap(bm));
@@ skipping 621 matching lines @@
             SkPictureRecorder rec;
             proc(rec.beginRecording(cull));
             sk_sp<SkDrawable> dr = rec.finishRecordingAsDrawable(
                                                  SkPictureRecorder::kReturnNullForEmpty_FinishFlag);
             REPORTER_ASSERT(r, !dr.get());
         }
     }
 }
 #endif