Re-reland: chromeos: Fix shelf appearing at login screen under mash

chrome/browser/chromeos/login/session/chrome_session_manager.cc

Index: chrome/browser/chromeos/login/session/chrome_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/chrome_session_manager.cc b/chrome/browser/chromeos/login/session/chrome_session_manager.cc
index 4e96f2b5eb7751bbe011e66a83bf3e052db53a55..bccc2f754e71138689aa6ae3f0d76bf65a178b77 100644
--- a/chrome/browser/chromeos/login/session/chrome_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/chrome_session_manager.cc
@@ -134,7 +134,6 @@ void StartRestoreAfterCrashSession(Profile* user_profile,
 
   bool is_running_test = command_line->HasSwitch(::switches::kTestName) ||
                          command_line->HasSwitch(::switches::kTestType);
-
   if (!is_running_test) {

[James Cook, 2017/01/11 00:39:50]

I took out the SessionControllerClient::FlushForTesting() in browser_tests
because I want tests to better simulate how ash starts up in production. This
also let me write a browser test for the crash.

     // Enable CrasAudioHandler logging when chrome restarts after crashing.
     if (chromeos::CrasAudioHandler::IsInitialized())