Convert JsonWriter::Write to taking a const ref for the in-param

gpu/tools/compositor_model_bench/render_tree.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/tools/compositor_model_bench/render_tree.h"
 
 #include <sstream>
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 424 matching lines @@
     return InterpretContentLayer(node);
   if (type == "CanvasLayer")
     return InterpretCanvasLayer(node);
   if (type == "VideoLayer")
     return InterpretVideoLayer(node);
   if (type == "ImageLayer")
     return InterpretImageLayer(node);
 
 
   string outjson;
-  JSONWriter::WriteWithOptions(node, base::JSONWriter::OPTIONS_PRETTY_PRINT,
+  JSONWriter::WriteWithOptions(*node, base::JSONWriter::OPTIONS_PRETTY_PRINT,
                                &outjson);
   LOG(ERROR) << "Unrecognized node type! JSON:\n\n"
       "-----------------------\n" <<
       outjson <<
       "-----------------------";
 
   return NULL;
 }
 
 RenderNode* BuildRenderTreeFromFile(const base::FilePath& path) {
@@ skipping 19 matching lines @@
     base::DictionaryValue* v = static_cast<base::DictionaryValue*>(root.get());
     RenderNode* tree = InterpretContentLayer(v);
     return tree;
   } else {
     LOG(ERROR) << path.LossyDisplayName() <<
         " doesn not encode a JSON dictionary.";
     return NULL;
   }
 }