Fix execution order to prevent browserTest being undefined.

For apps v1, authentication involves navigating away from the app and
then back again, so loading browser_test.js before authentication doesn't
work. I don't know why this is a recent regression though--AFAICT it should
have been failing from day 1.

BUG=414498

Review URL: https://codereview.chromium.org/571273002

Cr-Commit-Position: refs/heads/master@{#295091}

chrome/test/remoting/remote_desktop_browsertest.cc

@@ -467,8 +467,8 @@ void RemoteDesktopBrowserTest::SetUpTestForMe2Me() {
   VerifyInternetAccess();
   Install();
   LaunchChromotingApp();
-  LoadScript(app_web_content(), FILE_PATH_LITERAL("browser_test.js"));
   Auth();
+  LoadScript(app_web_content(), FILE_PATH_LITERAL("browser_test.js"));
   ExpandMe2Me();
   EnsureRemoteConnectionEnabled();
 }