Enable Chrome sandboxing on Linux

indra/newview/linux_tools/chrome_sandboxing_permissions_setup.sh

+#!/usr/bin/env bash
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+SANDBOX_BIN="$SCRIPT_DIR/../bin/llplugin/chrome-sandbox"
+
+chown root:root $SANDBOX_BIN
+chmod 4755 $SANDBOX_BIN