switch to using native JSON object

chrome/renderer/js_only_v8_extensions.cc

Index: chrome/renderer/js_only_v8_extensions.cc
diff --git a/chrome/renderer/js_only_v8_extensions.cc b/chrome/renderer/js_only_v8_extensions.cc
index d304ef1d6e4c5e5bb7c3a1230566e1aaeb2de9f5..577f1709c157841b15ee84d0f8ef6ef930d9423e 100644
--- a/chrome/renderer/js_only_v8_extensions.cc
+++ b/chrome/renderer/js_only_v8_extensions.cc
@@ -15,16 +15,6 @@ v8::Extension* BaseJsV8Extension::Get() {
                            0, NULL);
 }
 
-// JsonJsV8Extension
-const char* JsonJsV8Extension::kName = "chrome/json";
-v8::Extension* JsonJsV8Extension::Get() {
-  static const char* deps[] = {
-    BaseJsV8Extension::kName
-  };
-  return new v8::Extension(kName, GetStringResource<IDR_DEVTOOLS_JSON_JS>(),
-                           arraysize(deps), deps);
-}
-
 // JsonSchemaJsV8Extension
 const char* JsonSchemaJsV8Extension::kName = "chrome/jsonschema";
 v8::Extension* JsonSchemaJsV8Extension::Get() {