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

base/values.cc

Index: base/values.cc
diff --git a/base/values.cc b/base/values.cc
index f448f51d2bd3821005d85e976418882c1230466c..d4fbf1c553cb7928892c97d2cbcd4b19b451f5bc 100644
--- a/base/values.cc
+++ b/base/values.cc
@@ -1164,9 +1164,7 @@ ValueDeserializer::~ValueDeserializer() {
 
 std::ostream& operator<<(std::ostream& out, const Value& value) {
   std::string json;
-  JSONWriter::WriteWithOptions(&value,
-                               JSONWriter::OPTIONS_PRETTY_PRINT,
-                               &json);
+  JSONWriter::WriteWithOptions(value, JSONWriter::OPTIONS_PRETTY_PRINT, &json);
   return out << json;
 }