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

tools/skiaserve/urlhandlers/BreakHandler.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "UrlHandler.h"
 
 #include "microhttpd.h"
@@ skipping 62 matching lines @@
             endColor.append(Json::Value(SkColorGetB(current)));
             endColor.append(Json::Value(SkColorGetA(current)));
             response["endColor"] = endColor;
             response["endOp"] = Json::Value(index);
             break;
         }
     }
     canvas->restoreToCount(saveCount);
     SkDynamicMemoryWStream stream;
     stream.writeText(Json::FastWriter().write(response).c_str());
-    sk_sp<SkData> data(stream.copyToData());
-    return SendData(connection, data.get(), "application/json");
+    return SendData(connection, stream.detachAsData().get(), "application/json");
 }