MAGETWO-34649: Private content handling doesn't work when HTML profiler and develop mode are on

- disable profiling when private content handling ajax call

Author: eddielau

app/code/Magento/PageCache/Controller/Block/Render.php

@@ -19,7 +19,8 @@ public function execute()
             $this->_forward('noroute');
             return;
         }
-
+        // disable profiling during private content handling AJAX call
+        \Magento\Framework\Profiler::reset();
         $blocks = $this->_getBlocks();
         $data = [];
         foreach ($blocks as $blockName => $blockInstance) {