Update JSONReader to take base::StringPiece instead of std::string

chrome/browser/plugin_finder.cc

Index: chrome/browser/plugin_finder.cc
diff --git a/chrome/browser/plugin_finder.cc b/chrome/browser/plugin_finder.cc
index 2b66754ec5e3a02fdaabc6831f597e6b43cd300b..6656efc45fd4c279fb32a62fdd13d1fd2ed503f8 100644
--- a/chrome/browser/plugin_finder.cc
+++ b/chrome/browser/plugin_finder.cc
@@ -54,7 +54,7 @@ DictionaryValue* PluginFinder::LoadPluginListInternal() {
   bool allow_trailing_comma = false;
   std::string error_str;
   scoped_ptr<base::Value> value(base::JSONReader::ReadAndReturnError(
-      json_resource.as_string(),
+      json_resource,
       allow_trailing_comma,
       NULL,
       &error_str));