Remove differences in detecting logged in state between guest and regular user.

BUG=
TEST=trybot, manual.
NOTRY=True

Review URL: https://codereview.chromium.org/282303013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271530 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py

@@ -233,20 +233,16 @@ class CrOSBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
             not self.oobe_exists)
 
   def _WaitForLogin(self):
-    if self._is_guest:
-      self._WaitForBrowserToComeUp()
-      util.WaitFor(self._IsCryptohomeMounted, 30)
-      return
-
     # Wait for cryptohome to mount.
     util.WaitFor(self._IsLoggedIn, 60)
 
     # Wait for extensions to load.
     self._WaitForBrowserToComeUp()
 
-    # Workaround for crbug.com/329271, crbug.com/334726.
+    # Workaround for crbug.com/374462 - the bug doesn't manifest in the guest
+    # session, which also starts with an open browser tab.
     retries = 3
-    while True:
+    while not self._is_guest:
       try:
         # Open a new window/tab.
         tab = self.tab_list_backend.New(timeout=30)