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

tests/CachedDecodingPixelRefTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 20 matching lines @@
     canvas.drawRectCoords(0, 0, SkIntToScalar(W/2),
                           SkIntToScalar(H/2), paint);
     paint.setColor(SK_ColorWHITE);
     canvas.drawRectCoords(SkIntToScalar(W/2), SkIntToScalar(H/2),
                           SkIntToScalar(W), SkIntToScalar(H), paint);
 }
 
 /**
  * encode this bitmap into some data via SkImageEncoder
  */
-static SkData* create_data_from_bitmap(const SkBitmap& bm,
-                                       SkImageEncoder::Type type) {
+static sk_sp<SkData> create_data_from_bitmap(const SkBitmap& bm, SkImageEncoder::Type type) {
     SkDynamicMemoryWStream stream;
     if (SkImageEncoder::EncodeStream(&stream, bm, type, 100)) {
-        return stream.copyToData();
+        return stream.detachAsData();
     }
     return nullptr;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 static void compare_bitmaps(skiatest::Reporter* reporter,
                             const SkBitmap& b1, const SkBitmap& b2,
                             bool pixelPerfect = true) {
     REPORTER_ASSERT(reporter, b1.empty() == b2.empty());
@@ skipping 44 matching lines @@
     if (original.empty() || original.isNull()) {
         return;
     }
     static const SkImageEncoder::Type types[] = {
         SkImageEncoder::kPNG_Type,
         SkImageEncoder::kJPEG_Type,
         SkImageEncoder::kWEBP_Type
     };
     for (size_t i = 0; i < SK_ARRAY_COUNT(types); i++) {
         SkImageEncoder::Type type = types[i];
-        sk_sp<SkData> encoded(create_data_from_bitmap(original, type));
+        sk_sp<SkData> encoded = create_data_from_bitmap(original, type);
         REPORTER_ASSERT(reporter, encoded.get() != nullptr);
         if (nullptr == encoded.get()) {
             continue;
         }
         SkBitmap lazy;
         bool installSuccess = install(encoded.get(), &lazy);
         REPORTER_ASSERT(reporter, installSuccess);
         if (!installSuccess) {
             continue;
         }
@@ skipping 218 matching lines @@
             if (TestImageGenerator::kSucceedGetPixels_TestType == test) {
                 REPORTER_ASSERT(
                     r, TestImageGenerator::Color() == bitmap.getColor(0, 0));
             }
             else {
                 REPORTER_ASSERT(r, kDefaultColor == bitmap.getColor(0, 0));
             }
         }
     }
 }