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

tools/skdiff_utils.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 "skdiff.h"
 #include "skdiff_utils.h"
 #include "SkBitmap.h"
 #include "SkCodec.h"
@@ skipping 15 matching lines @@
 }
 
 sk_sp<SkData> read_file(const char* file_path) {
     sk_sp<SkData> data(SkData::MakeFromFileName(file_path));
     if (!data) {
         SkDebugf("WARNING: could not open file <%s> for reading\n", file_path);
     }
     return data;
 }
 
-bool get_bitmap(SkData* fileBits, DiffResource& resource, bool sizeOnly) {
+bool get_bitmap(sk_sp<SkData> fileBits, DiffResource& resource, bool sizeOnly) {
     SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(fileBits));
     if (!codec) {
         SkDebugf("ERROR: could not create codec for <%s>\n", resource.fFullPath.c_str());
         resource.fStatus = DiffResource::kCouldNotDecode_Status;
         return false;
     }
 
     if (!resource.fBitmap.setInfo(codec->getInfo().makeColorType(kN32_SkColorType))) {
         SkDebugf("ERROR: could not set bitmap info for <%s>\n", resource.fFullPath.c_str());
         resource.fStatus = DiffResource::kCouldNotDecode_Status;
@@ skipping 123 matching lines @@
                 drp->fDifference.fStatus = DiffResource::kDoesNotExist_Status;
             }
             if (write_bitmap(drp->fWhite.fFullPath, drp->fWhite.fBitmap)) {
                 drp->fWhite.fStatus = DiffResource::kExists_Status;
             } else {
                 drp->fWhite.fStatus = DiffResource::kDoesNotExist_Status;
             }
         }
     }
 }