[Password Manager] Remove the "manager-for-sync-signin" flags.

components/password_manager/core/common/password_manager_switches.cc

Index: components/password_manager/core/common/password_manager_switches.cc
diff --git a/components/password_manager/core/common/password_manager_switches.cc b/components/password_manager/core/common/password_manager_switches.cc
index 7dd66b25ef8fea5c0160f644731d7d77395b61ed..abae7eb85f809a4aa773d3d9f8a20eb7eb292a07 100644
--- a/components/password_manager/core/common/password_manager_switches.cc
+++ b/components/password_manager/core/common/password_manager_switches.cc
@@ -20,9 +20,6 @@ const char kDisableAffiliationBasedMatching[] =
 // Disable dropping the credential used to sync passwords.
 const char kDisableDropSyncCredential[] = "disable-drop-sync-credential";
 
-// Disable both saving and filling for the sync signin form.
-const char kDisableManagerForSyncSignin[] = "disable-manager-for-sync-signin";
-
 // Disallow autofilling of the sync credential.
 const char kDisallowAutofillSyncCredential[] =
     "disallow-autofill-sync-credential";
@@ -41,10 +38,6 @@ const char kEnableAffiliationBasedMatching[] =
 // Enable dropping the credential used to sync passwords.
 const char kEnableDropSyncCredential[] = "enable-drop-sync-credential";
 
-// Enable saving and filling for the sync signin form. Currently the default
-// behavior.
-const char kEnableManagerForSyncSignin[] = "enable-manager-for-sync-signin";
-
 }  // namespace switches
 
 }  // namespace password_manager