Revert of [sync] Sign user out of Chrome on dashboard stop and reset

chrome/browser/android/signin/signin_manager_android.cc

Index: chrome/browser/android/signin/signin_manager_android.cc
diff --git a/chrome/browser/android/signin/signin_manager_android.cc b/chrome/browser/android/signin/signin_manager_android.cc
index c1e5d83aad8473e074333d2b69fe98479b5f4af9..233fa412fa86ff71681401ea2e498a6416f6f4fc 100644
--- a/chrome/browser/android/signin/signin_manager_android.cc
+++ b/chrome/browser/android/signin/signin_manager_android.cc
@@ -86,7 +86,6 @@
   java_signin_manager_.Reset(env, obj);
   profile_ = ProfileManager::GetActiveUserProfile();
   DCHECK(profile_);
-  SigninManagerFactory::GetForProfile(profile_)->AddObserver(this);
   pref_change_registrar_.Init(profile_->GetPrefs());
   pref_change_registrar_.Add(
       prefs::kSigninAllowed,
@@ -270,20 +269,6 @@
   return SigninManagerFactory::GetForProfile(profile_)->IsAuthenticated();
 }
 
-void SigninManagerAndroid::GoogleSigninFailed(
-    const GoogleServiceAuthError& error) {}
-
-void SigninManagerAndroid::GoogleSigninSucceeded(const std::string& account_id,
-                                                 const std::string& username,
-                                                 const std::string& password) {}
-
-void SigninManagerAndroid::GoogleSignedOut(const std::string& account_id,
-                                           const std::string& username) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  Java_SigninManager_onNativeSignOut(base::android::AttachCurrentThread(),
-                                     java_signin_manager_.obj());
-}
-
 void SigninManagerAndroid::OnSigninAllowedPrefChanged() {
   Java_SigninManager_onSigninAllowedByPolicyChanged(
       base::android::AttachCurrentThread(), java_signin_manager_.obj(),