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

tests/TypefaceTest.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 "SkData.h"
 #include "SkOTTable_OS_2.h"
 #include "SkSFNTHeader.h"
 #include "SkStream.h"
 #include "SkRefCnt.h"
 #include "SkTypeface.h"
 #include "SkTypefaceCache.h"
 #include "Resources.h"
 #include "Test.h"
 
 #include <memory>
 
 static void TypefaceStyle_test(skiatest::Reporter* reporter,
                                uint16_t weight, uint16_t width, SkData* data)
 {
     sk_sp<SkData> dataCopy;
-    SkData* dataToUse = data;
-    if (!dataToUse->unique()) {
+    if (!data->unique()) {
         dataCopy = SkData::MakeWithCopy(data->data(), data->size());
-        dataToUse = dataCopy.get();
+        data = dataCopy.get();
     }
-    SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(dataToUse->writable_data());
+    SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(data->writable_data());
 
     SkSFNTHeader::TableDirectoryEntry* tableEntry =
         SkTAfter<SkSFNTHeader::TableDirectoryEntry>(sfntHeader);
     SkSFNTHeader::TableDirectoryEntry* os2TableEntry = nullptr;
     int numTables = SkEndian_SwapBE16(sfntHeader->numTables);
     for (int tableEntryIndex = 0; tableEntryIndex < numTables; ++tableEntryIndex) {
         if (SkOTTableOS2::TAG == tableEntry[tableEntryIndex].tag) {
             os2TableEntry = tableEntry + tableEntryIndex;
             break;
         }
     }
     SkASSERT_RELEASE(os2TableEntry);
 
     size_t os2TableOffset = SkEndian_SwapBE32(os2TableEntry->offset);
     SkOTTableOS2_V0* os2Table = SkTAddOffset<SkOTTableOS2_V0>(sfntHeader, os2TableOffset);
     os2Table->usWeightClass.value = SkEndian_SwapBE16(weight);
     using WidthType = SkOTTableOS2_V0::WidthClass::Value;
     os2Table->usWidthClass.value = static_cast<WidthType>(SkEndian_SwapBE16(width));
 
-    sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(dataToUse)));
+    sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(sk_ref_sp(data))));
     SkASSERT_RELEASE(newTypeface);
 
     SkFontStyle newStyle = newTypeface->fontStyle();
 
     //printf("%d, %f\n", weight, (newStyle.weight() - (float)0x7FFF) / (float)0x7FFF);
     //printf("%d, %f\n", width , (newStyle.width()  - (float)0x7F)   / (float)0x7F);
     //printf("%d, %d\n", weight, newStyle.weight());
     //printf("%d, %d\n", width , newStyle.width());
 
     // Some back-ends (CG, GDI, DW) support OS/2 version A which uses 0 - 10 (but all differently).
@@ skipping 106 matching lines @@
             REPORTER_ASSERT(reporter, count(reporter, cache) == 2);
             cache.purgeAll();
             REPORTER_ASSERT(reporter, count(reporter, cache) == 2);
         }
         REPORTER_ASSERT(reporter, count(reporter, cache) == 2);
         cache.purgeAll();
         REPORTER_ASSERT(reporter, count(reporter, cache) == 1);
     }
     REPORTER_ASSERT(reporter, t1->unique());
 }