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

chrome/browser/devtools/devtools_ui_bindings.cc

Index: chrome/browser/devtools/devtools_ui_bindings.cc
diff --git a/chrome/browser/devtools/devtools_ui_bindings.cc b/chrome/browser/devtools/devtools_ui_bindings.cc
index 3a5d3ca03d87f6b3bef5a304bb3474f57fe1a817..69ab19f9fca8a162fcf164dfa22b7248ca16e51b 100644
--- a/chrome/browser/devtools/devtools_ui_bindings.cc
+++ b/chrome/browser/devtools/devtools_ui_bindings.cc
@@ -1016,13 +1016,13 @@ void DevToolsUIBindings::CallClientFunction(const std::string& function_name,
   std::string javascript = function_name + "(";
   if (arg1) {
     std::string json;
-    base::JSONWriter::Write(arg1, &json);
+    base::JSONWriter::Write(*arg1, &json);
     javascript.append(json);
     if (arg2) {
-      base::JSONWriter::Write(arg2, &json);
+      base::JSONWriter::Write(*arg2, &json);
       javascript.append(", ").append(json);
       if (arg3) {
-        base::JSONWriter::Write(arg3, &json);
+        base::JSONWriter::Write(*arg3, &json);
         javascript.append(", ").append(json);
       }
     }