Implementation of sync password hash clearing.

components/password_manager/core/browser/password_reuse_detector.cc

Index: components/password_manager/core/browser/password_reuse_detector.cc
diff --git a/components/password_manager/core/browser/password_reuse_detector.cc b/components/password_manager/core/browser/password_reuse_detector.cc
index a06e94eb1838d049822ad0a581cecc05099f8d86..5bf0abb361f9b1000de4c104cd6e484b568cc74c 100644
--- a/components/password_manager/core/browser/password_reuse_detector.cc
+++ b/components/password_manager/core/browser/password_reuse_detector.cc
@@ -137,6 +137,12 @@ void PasswordReuseDetector::SaveSyncPasswordHash(
   }
 }
 
+void PasswordReuseDetector::ClearSyncPasswordHash() {
+  sync_password_hash_.reset();
+  if (prefs_)
+    prefs_->ClearPref(prefs::kSyncPasswordHash);
+}
+
 void PasswordReuseDetector::AddPassword(const autofill::PasswordForm& form) {
   if (form.password_value.size() < kMinPasswordLengthToCheck)
     return;