[Signin][Android] Fix access point assert in SigninFragment

SigninFragment is never used with START_PAGE access point (we have
SigninFirstRunFragment for that), so assert shouldn't allow thi value.

Bug: 657587
Change-Id: I238b8366d6042db8b53c4318f1e457799254759b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089876
Auto-Submit: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748152}

chrome/android/java/src/org/chromium/chrome/browser/signin/SigninFragment.java

@@ -104,9 +104,8 @@ public class SigninFragment extends SigninFragmentBase {
                 || accessPoint == SigninAccessPoint.NTP_CONTENT_SUGGESTIONS
                 || accessPoint == SigninAccessPoint.RECENT_TABS
                 || accessPoint == SigninAccessPoint.SETTINGS
-                || accessPoint == SigninAccessPoint.SIGNIN_PROMO
                 || accessPoint
-                        == SigninAccessPoint.START_PAGE : "invalid access point: " + accessPoint;
+                        == SigninAccessPoint.SIGNIN_PROMO : "invalid access point: " + accessPoint;
         mSigninAccessPoint = accessPoint;
         mPromoAction =
                 getSigninArguments().getInt(ARGUMENT_PERSONALIZED_PROMO_ACTION, PromoAction.NONE);