Do not allow sign in if Google play service is absent

chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java
index 318d2675f9cf9ab65725af90d7ec38b28ed40213..32dfda7d5cbbfbdb76d0f45fc6d79cb216201dd0 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/MainPreferences.java
@@ -76,17 +76,16 @@ public class MainPreferences extends PreferenceFragment
         // the SignInPreference.
         updatePreferences();
 
-        if (!mIsDemoUser) {
+        if (isUserAllowedToSignIn()) {
             SigninManager.get(getActivity()).addSignInStateObserver(this);
             setupSignInPref();
         }
-
     }
 
     @Override
     public void onPause() {
         super.onPause();
-        if (!mIsDemoUser) {
+        if (isUserAllowedToSignIn()) {
             SigninManager.get(getActivity()).removeSignInStateObserver(this);
             clearSignInPref();
         }
@@ -169,7 +168,7 @@ public class MainPreferences extends PreferenceFragment
             getPreferenceScreen().removePreference(dataReduction);
         }
 
-        if (mIsDemoUser) {
+        if (!isUserAllowedToSignIn()) {
             getPreferenceScreen().removePreference(findPreference(PREF_SIGN_IN));
         }
     }
@@ -225,6 +224,11 @@ public class MainPreferences extends PreferenceFragment
         updatePreferences();
     }
 
+    private boolean isUserAllowedToSignIn() {
+        boolean allowSignIn = SigninManager.get(getActivity()).isSignInAllowed();
+        return allowSignIn && !mIsDemoUser;
+    }
+
     private ManagedPreferenceDelegate createManagedPreferenceDelegate() {
         return new ManagedPreferenceDelegate() {
             @Override