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

extensions/browser/value_store/value_store_unittest.cc

Index: extensions/browser/value_store/value_store_unittest.cc
diff --git a/extensions/browser/value_store/value_store_unittest.cc b/extensions/browser/value_store/value_store_unittest.cc
index 4293459aa6752989ef5aaa534373a4c04561a5f5..c2ecbab54de8ae08350450e369d9baa92585d1e0 100644
--- a/extensions/browser/value_store/value_store_unittest.cc
+++ b/extensions/browser/value_store/value_store_unittest.cc
@@ -18,9 +18,8 @@ const ValueStore::WriteOptions DEFAULTS = ValueStore::DEFAULTS;
 // Gets the pretty-printed JSON for a value.
 std::string GetJSON(const base::Value& value) {
   std::string json;
-  base::JSONWriter::WriteWithOptions(&value,
-                                     base::JSONWriter::OPTIONS_PRETTY_PRINT,
-                                     &json);
+  base::JSONWriter::WriteWithOptions(
+      value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &json);
   return json;
 }