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

components/cloud_devices/common/printer_description_unittest.cc

Index: components/cloud_devices/common/printer_description_unittest.cc
diff --git a/components/cloud_devices/common/printer_description_unittest.cc b/components/cloud_devices/common/printer_description_unittest.cc
index c1fb455cd3c149ffd817e852d803e108e3147c17..5c8b182fcb6fa5938b0f85b0e719365f5935e751 100644
--- a/components/cloud_devices/common/printer_description_unittest.cc
+++ b/components/cloud_devices/common/printer_description_unittest.cc
@@ -22,7 +22,7 @@ std::string NormalizeJson(const std::string& json) {
   base::ReplaceChars(result, "'", "\"", &result);
   scoped_ptr<base::Value> value(base::JSONReader::Read(result));
   DCHECK(value);
-  base::JSONWriter::Write(value.get(), &result);
+  base::JSONWriter::Write(*value, &result);
   return result;
 }