[chromedriver] Load automation extension using --disable-extensions-except for M57+.

chrome/test/chromedriver/chrome_launcher.cc

Index: chrome/test/chromedriver/chrome_launcher.cc
diff --git a/chrome/test/chromedriver/chrome_launcher.cc b/chrome/test/chromedriver/chrome_launcher.cc
index 224d609bc1457911310a9f264669dbc677c63ad6..567637e8b6466ca68c2d386376f7008012edd8ed 100644
--- a/chrome/test/chromedriver/chrome_launcher.cc
+++ b/chrome/test/chromedriver/chrome_launcher.cc
@@ -783,8 +783,12 @@ Status ProcessExtensions(const std::vector<std::string>& extensions,
                           automation_extension.value());
 #else
     if (switches->HasSwitch("disable-extensions")) {
+      // For Chrome 56 and earlier:
       UpdateExtensionSwitch(switches, "load-component-extension",
                             automation_extension.value());
+      // For Chrome 57 and later:
+      UpdateExtensionSwitch(switches, "disable-extensions-except",
+                            automation_extension.value());
     } else {
       extension_paths.push_back(automation_extension.value());
     }