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

net/test/base_test_server.cc

Index: net/test/base_test_server.cc
diff --git a/net/test/base_test_server.cc b/net/test/base_test_server.cc
index eefd953a2c592c14feaceda2f84d437298e564d6..8a78ea7f7b8d776312b5036979975e0c420824ad 100644
--- a/net/test/base_test_server.cc
+++ b/net/test/base_test_server.cc
@@ -254,7 +254,7 @@ void BaseTestServer::SetResourcePath(const FilePath& document_root,
 bool BaseTestServer::ParseServerData(const std::string& server_data) {
   VLOG(1) << "Server data: " << server_data;
   base::JSONReader json_reader;
-  scoped_ptr<Value> value(json_reader.JsonToValue(server_data, true, false));
+  scoped_ptr<Value> value(json_reader.ReadToValue(server_data));
   if (!value.get() || !value->IsType(Value::TYPE_DICTIONARY)) {
     LOG(ERROR) << "Could not parse server data: "
                << json_reader.GetErrorMessage();