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

tests/PDFPrimitivesTest.cpp

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 88 matching lines @@
         SkDynamicMemoryWStream compressedByteStream;
         SkDeflateWStream deflateWStream(&compressedByteStream);
         deflateWStream.write(streamBytes2, strlen(streamBytes2));
         deflateWStream.finalize();
 
         SkDynamicMemoryWStream expected;
         expected.writeText("<</Filter /FlateDecode\n/Length 116>> stream\n");
         compressedByteStream.writeToStream(&expected);
         compressedByteStream.reset();
         expected.writeText("\nendstream");
-        sk_sp<SkData> expectedResultData2(expected.copyToData());
+        sk_sp<SkData> expectedResultData2(expected.detachAsData());
         SkString result = emit_to_string(*stream);
         #ifndef SK_PDF_LESS_COMPRESSION
         assert_eql(reporter,
                    result,
                    (const char*)expectedResultData2->data(),
                    expectedResultData2->size());
         #endif
     }
 }
 
@@ skipping 359 matching lines @@
     char buffer[5];
     for (int i = 0; i < 256; ++i) {
         size_t len = SkPDFUtils::ColorToDecimal(i, buffer);
         REPORTER_ASSERT(reporter, len == strlen(buffer));
         float f;
         REPORTER_ASSERT(reporter, 1 == sscanf(buffer, "%f", &f));
         int roundTrip = (int)(0.5 + f * 255);
         REPORTER_ASSERT(reporter, roundTrip == i);
     }
 }