Fix typo in session_manager_types.h

Fix typo in session_manager_types.h by renaming
SESSION_STATE_LOGIN_PRIMARY to LOGIN_PRIMARY.

Also this change helps to be consistent within the file when mention
states in comments.

Change-Id: I268421fc01d79fa712da41da6a97ea04f253430f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450072
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813949}

components/session_manager/session_manager_types.h

@@ -33,8 +33,8 @@ enum class SessionState {
   // The session screen is locked.
   LOCKED,
 
-  // Same as SESSION_STATE_LOGIN_PRIMARY but for multi-profiles sign in i.e.
-  // when there's at least one user already active in the session.
+  // Same as LOGIN_PRIMARY but for multi-profiles sign in i.e. when there's at
+  // least one user already active in the session.
   LOGIN_SECONDARY,
 };