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

remoting/host/token_validator_factory_impl_unittest.cc

Index: remoting/host/token_validator_factory_impl_unittest.cc
diff --git a/remoting/host/token_validator_factory_impl_unittest.cc b/remoting/host/token_validator_factory_impl_unittest.cc
index bfbed9f38b08dcd8915193dac82d56f820753496..aa5a024ff2566b80eb3b46bbc45aa6da34ee53ba 100644
--- a/remoting/host/token_validator_factory_impl_unittest.cc
+++ b/remoting/host/token_validator_factory_impl_unittest.cc
@@ -108,7 +108,7 @@ class TokenValidatorFactoryImplTest : public testing::Test {
     response_dict.SetString("token_type", "shared_secret");
     response_dict.SetString("scope", scope);
     std::string response;
-    base::JSONWriter::Write(&response_dict, &response);
+    base::JSONWriter::Write(response_dict, &response);
     return response;
   }
 
@@ -116,7 +116,7 @@ class TokenValidatorFactoryImplTest : public testing::Test {
     base::DictionaryValue response_dict;
     response_dict.SetString("error", error);
     std::string response;
-    base::JSONWriter::Write(&response_dict, &response);
+    base::JSONWriter::Write(response_dict, &response);
     return response;
   }