Rewrite base::JSONReader to be 35-40% faster, depending on the input string.

chrome/common/extensions/api/extension_api.cc

Index: chrome/common/extensions/api/extension_api.cc
diff --git a/chrome/common/extensions/api/extension_api.cc b/chrome/common/extensions/api/extension_api.cc
index 97e7e11ef9288e5083ae9b2b29588e98725bc10c..2d17a0b2abac4fc9fe1c3ed49b35d1c2005304bb 100644
--- a/chrome/common/extensions/api/extension_api.cc
+++ b/chrome/common/extensions/api/extension_api.cc
@@ -70,7 +70,7 @@ scoped_ptr<ListValue> LoadSchemaList(const std::string& name,
   scoped_ptr<Value> result(
       base::JSONReader::ReadAndReturnError(
           schema.as_string(),
-          base::JSON_PARSE_RFC,  // options
+          base::JSON_PARSE_RFC | base::JSON_DETACHABLE_CHILDREN,  // options
           NULL,  // error code
           &error_message));