Clear list of pending /ListAccount callsbacks when shutting down or when

components/signin/core/browser/account_reconcilor.cc

Index: components/signin/core/browser/account_reconcilor.cc
diff --git a/components/signin/core/browser/account_reconcilor.cc b/components/signin/core/browser/account_reconcilor.cc
index 4d7cf9789b867f93ecd230d2f2f755203ae88023..65c737073da99ed03a8c65ed08eabed9af3ead86 100644
--- a/components/signin/core/browser/account_reconcilor.cc
+++ b/components/signin/core/browser/account_reconcilor.cc
@@ -237,6 +237,7 @@ void AccountReconcilor::Shutdown() {
   merge_session_helper_.CancelAll();
   merge_session_helper_.RemoveObserver(this);
   gaia_fetcher_.reset();
+  get_gaia_accounts_callbacks_.clear();
   DeleteFetchers();
   UnregisterWithSigninManager();
   UnregisterWithTokenService();
@@ -349,6 +350,7 @@ void AccountReconcilor::GoogleSigninSucceeded(const std::string& username,
 void AccountReconcilor::GoogleSignedOut(const std::string& username) {
   VLOG(1) << "AccountReconcilor::GoogleSignedOut: signed out";
   gaia_fetcher_.reset();
+  get_gaia_accounts_callbacks_.clear();
   AbortReconcile();
   UnregisterWithTokenService();
   UnregisterForCookieChanges();